From 4dfb67bc45e2a0cfc5c24a43f9f9998c88308ec2 Mon Sep 17 00:00:00 2001
From: Harald Hoyer <harald@redhat.com>
Date: Mon, 4 Mar 2019 11:46:17 +0100
Subject: [PATCH] publish: Cargo.toml: 0.4.3

generated from commit deaaf4ce9fbe515c49b0529358206ff7c57d8b59
---
 end.html         |    6 +-
 index.html       |    2 +-
 print.html       | 1306 ++++++++++++++++++++++++++++++++++++----------
 searchindex.js   |    2 +-
 searchindex.json |    2 +-
 tutorial1.html   |    2 +-
 tutorial10.html  |   29 +-
 tutorial11.html  |   29 +-
 tutorial12.html  |   33 +-
 tutorial13.html  | 1210 ++++++++++++++++++++++++++++++++++++++++++
 tutorial2.html   |   29 +-
 tutorial3.html   |   29 +-
 tutorial4.html   |   29 +-
 tutorial5.html   |   29 +-
 tutorial6.html   |   29 +-
 tutorial7.html   |   29 +-
 tutorial8.html   |   29 +-
 tutorial9.html   |   29 +-
 18 files changed, 2282 insertions(+), 571 deletions(-)
 create mode 100644 tutorial13.html

diff --git a/end.html b/end.html
index cd9e7e9..88cf02d 100644
--- a/end.html
+++ b/end.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html" class="active">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html" class="active">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -151,7 +151,7 @@ the <a href="https://github.com/haraldh/chainerror">Git Repo</a>.</p>
                     <nav class="nav-wrapper" aria-label="Page navigation">
                         <!-- Mobile navigation buttons -->
                         
-                            <a rel="prev" href="tutorial12.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                            <a rel="prev" href="tutorial13.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                                 <i class="fa fa-angle-left"></i>
                             </a>
                         
@@ -165,7 +165,7 @@ the <a href="https://github.com/haraldh/chainerror">Git Repo</a>.</p>
 
             <nav class="nav-wide-wrapper" aria-label="Page navigation">
                 
-                    <a href="tutorial12.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
+                    <a href="tutorial13.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
                         <i class="fa fa-angle-left"></i>
                     </a>
                 
diff --git a/index.html b/index.html
index be75167..8c465d7 100644
--- a/index.html
+++ b/index.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
diff --git a/print.html b/print.html
index a8d9060..c2e891c 100644
--- a/print.html
+++ b/print.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -299,7 +299,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 <p>With relatively small changes and the help of the <code>cherr!</code> macro of the <code>chainerror</code> crate
 the <code>String</code> errors are now chained together.</p>
 <p>Press the play button in the upper right corner and see the nice debug output.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 
 use std::error::Error;
 use std::io;
@@ -327,6 +327,7 @@ fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     func1()
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -1015,15 +1016,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -1118,21 +1113,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1185,21 +1171,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -1291,7 +1268,7 @@ prints the <code>Debug</code> of <code>T</code> prefixed with the stored filenam
 <p><code>ChainError&lt;T&gt;</code> in our case is <code>ChainError&lt;String&gt;</code>.</p>
 <a class="header" href="#mapping-errors" id="mapping-errors"><h1>Mapping Errors</h1></a>
 <p>Now let's get more rust idiomatic by using <code>.map_err()</code>.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 
 use std::error::Error;
 use std::io;
@@ -1318,6 +1295,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -2006,15 +1984,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -2109,21 +2081,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -2176,21 +2139,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -2283,7 +2237,7 @@ let you jump through hoops, <code>chainerror</code> has a quick macro for that.<
 <p><code>mstrerror!()</code> fits right into <code>.map_err()</code> letting you quickly add
 more debug strings.</p>
 <p><code>mstrerror!()</code> even understands <code>format!()</code> syntax like <code>println!()</code>.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -2310,6 +2264,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -2998,15 +2953,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -3101,21 +3050,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -3168,21 +3108,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -3262,7 +3193,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 <a class="header" href="#the-source-of-errors" id="the-source-of-errors"><h1>The source() of Errors</h1></a>
 <p>Sometimes you want to inspect the <code>source()</code> of an <code>Error</code>.
 <code>chainerror</code> implements <code>std::error::Error::source()</code>, so you can get the cause of an error.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -3294,6 +3225,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -3982,15 +3914,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -4085,21 +4011,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -4152,21 +4069,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -4253,7 +4161,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 pub fn downcast_mut&lt;T: Error + 'static&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut T&gt;
 </code></pre>
 <p>This is how it looks like, when using those:</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -4293,6 +4201,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -4981,15 +4890,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -5084,21 +4987,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -5151,21 +5045,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -5260,7 +5145,7 @@ to call <code>.find_cause::&lt;io::Error&gt;()</code>.</p>
 <p>or to use <code>.root_cause()</code>, which of course can be of any type implementing <code>std::error::Error</code>.</p>
 <pre><code class="language-rust ignore">            if let Some(e) = s.root_cause() {
 </code></pre>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -5301,6 +5186,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -5989,15 +5875,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -6092,21 +5972,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -6159,21 +6030,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -6265,7 +6127,7 @@ derive_str_cherr!(Func1Error);
 <pre><code class="language-rust ignore">            if let Some(f2err) = f1err.find_cause::&lt;ChainError&lt;Func2Error&gt;&gt;() {
 </code></pre>
 <p>hiding the <code>ChainError&lt;T&gt;</code> implementation detail.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -6306,6 +6168,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -6994,15 +6857,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -7097,21 +6954,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -7164,21 +7012,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -7274,7 +7113,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 </code></pre>
 <p>but this is not valid rust code, so we end up doing it the hard way.
 In the next chapter, we will see, how to solve this more elegantly.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -7314,6 +7153,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -8002,15 +7842,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -8105,21 +7939,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -8172,21 +7997,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -8274,7 +8090,7 @@ use <code>ChainResult&lt;(), Func1ErrorKind&gt;</code>.</p>
 <p>In <code>main</code> we can now directly use the methods of <code>ChainError&lt;T&gt;</code> without downcasting the error first.</p>
 <p>Also a nice <code>match</code> on <code>ChainError&lt;T&gt;.kind()</code> is now possible, which returns <code>&amp;T</code>, meaning
 <code>&amp;Func1ErrorKind</code> here.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -8332,6 +8148,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -9020,15 +8837,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -9123,21 +8934,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -9190,21 +8992,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -9297,7 +9090,7 @@ src/main.rs:40: func1 error calling func2
 <p>To create your own Errors, you might find <a href="https://crates.io">crates</a> which create enum <code>Display+Debug</code> via derive macros.</p>
 <p>Also noteworthy is <a href="https://crates.io/crates/custom_error">custom_error</a> to define your custom errors,
 which can then be used with <code>chainerror</code>.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -9361,6 +9154,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -10049,15 +9843,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -10152,21 +9940,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -10219,21 +9998,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -10313,7 +10083,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 <a class="header" href="#deref-for-the-errorkind" id="deref-for-the-errorkind"><h1>Deref for the ErrorKind</h1></a>
 <p>Because ChainError<T> implements Deref to &amp;T, we can also match on <code>*e</code> instead of <code>e.kind()</code>
 or call a function with <code>&amp;e</code></p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -10388,6 +10158,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -11076,15 +10847,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -11179,21 +10944,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -11246,21 +11002,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -11337,6 +11084,1013 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # }
 # }
 </code></pre></pre>
+<a class="header" href="#writing-a-library" id="writing-a-library"><h1>Writing a library</h1></a>
+<p>I would advise to only expose an <code>mycrate::ErrorKind</code> and type alias <code>mycrate::Error</code> to <code>ChainError&lt;mycrate::ErrorKind&gt;</code>
+so you can tell your library users to use the <code>.kind()</code> method as <code>std::io::Error</code> does.</p>
+<p>If you later decide to make your own <code>Error</code> implementation, your library users don't
+have to change much or anything.</p>
+<pre><pre class="playpen"><code class="language-rust"># #[allow(dead_code)]
+# #[macro_use]
+# pub mod chainerror {
+# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
+# //! binaries, you still have the error backtrace.
+# //!
+# //! `chainerror` has no dependencies!
+# //!
+# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.
+# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.
+# //!
+# //! Along with the `ChainError&lt;T&gt;` struct, `chainerror` comes with some useful helper macros to save a lot of typing.
+# //!
+# //! ## Features
+# //!
+# //! `no-fileline`
+# //! : completely turn off storing filename and line
+# //!
+# //! `display-cause`
+# //! : turn on printing a backtrace of the errors in `Display`
+# //!
+# //! `no-debug-cause`
+# //! : turn off printing a backtrace of the errors in `Debug`
+# //!
+# //!
+# //! # Tutorial
+# //!
+# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)
+# //!
+# //! # Examples
+# //!
+# //! ~~~rust
+# //! use chainerror::*;
+# //! use std::error::Error;
+# //! use std::io;
+# //! use std::result::Result;
+# //!
+# //! fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     let filename = &quot;foo.txt&quot;;
+# //!     do_some_io().map_err(mstrerr!(&quot;Error reading '{}'&quot;, filename))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     func2().map_err(mstrerr!(&quot;func1 error&quot;))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn main() {
+# //!     if let Err(e) = func1() {
+# //!         #[cfg(not(windows))]
+# //!         assert_eq!(
+# //!             format!(&quot;\n{:?}\n&quot;, e), r#&quot;
+# //! src/lib.rs:20: func1 error
+# //! Caused by:
+# //! src/lib.rs:15: Error reading 'foo.txt'
+# //! Caused by:
+# //! Kind(NotFound)
+# //! &quot;#
+# //!         );
+# //!     }
+# //! #    else {
+# //! #        unreachable!();
+# //! #    }
+# //! }
+# //! ~~~
+# //!
+# //!
+# //! ~~~rust
+# //! use chainerror::*;
+# //! use std::error::Error;
+# //! use std::io;
+# //! use std::result::Result;
+# //!
+# //! fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn func3() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     let filename = &quot;foo.txt&quot;;
+# //!     do_some_io().map_err(mstrerr!(&quot;Error reading '{}'&quot;, filename))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! derive_str_cherr!(Func2Error);
+# //!
+# //! fn func2() -&gt; ChainResult&lt;(), Func2Error&gt; {
+# //!     func3().map_err(mstrerr!(Func2Error, &quot;func2 error: calling func3&quot;))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! enum Func1Error {
+# //!     Func2,
+# //!     IO(String),
+# //! }
+# //!
+# //! impl ::std::fmt::Display for Func1Error {
+# //!     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+# //!         match self {
+# //!             Func1Error::Func2 =&gt; write!(f, &quot;func1 error calling func2&quot;),
+# //!             Func1Error::IO(filename) =&gt; write!(f, &quot;Error reading '{}'&quot;, filename),
+# //!         }
+# //!     }
+# //! }
+# //!
+# //! impl ::std::fmt::Debug for Func1Error {
+# //!     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+# //!         write!(f, &quot;{}&quot;, self)
+# //!     }
+# //! }
+# //!
+# //! fn func1() -&gt; ChainResult&lt;(), Func1Error&gt; {
+# //!     func2().map_err(|e| cherr!(e, Func1Error::Func2))?;
+# //!     let filename = String::from(&quot;bar.txt&quot;);
+# //!     do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn main() {
+# //!     if let Err(e) = func1() {
+# //!         assert!(
+# //!             match e.kind() {
+# //!                 Func1Error::Func2 =&gt; {
+# //!                     eprintln!(&quot;Main Error Report: func1 error calling func2&quot;);
+# //!                     true
+# //!                 }
+# //!                 Func1Error::IO(filename) =&gt; {
+# //!                     eprintln!(&quot;Main Error Report: func1 error reading '{}'&quot;, filename);
+# //!                     false
+# //!                 }
+# //!             }
+# //!         );
+# //!
+# //!         assert!(e.find_chain_cause::&lt;Func2Error&gt;().is_some());
+# //!
+# //!         if let Some(e) = e.find_chain_cause::&lt;Func2Error&gt;() {
+# //!             eprintln!(&quot;\nError reported by Func2Error: {}&quot;, e)
+# //!         }
+# //!
+# //!
+# //!         assert!(e.root_cause().is_some());
+# //!
+# //!         if let Some(e) = e.root_cause() {
+# //!             let ioerror = e.downcast_ref::&lt;io::Error&gt;().unwrap();
+# //!             eprintln!(&quot;\nThe root cause was: std::io::Error: {:#?}&quot;, ioerror);
+# //!         }
+# //!
+# //!         #[cfg(not(windows))]
+# //!         assert_eq!(
+# //!             format!(&quot;\n{:?}\n&quot;, e), r#&quot;
+# //! src/lib.rs:47: func1 error calling func2
+# //! Caused by:
+# //! src/lib.rs:22: Func2Error(func2 error: calling func3)
+# //! Caused by:
+# //! src/lib.rs:15: Error reading 'foo.txt'
+# //! Caused by:
+# //! Kind(NotFound)
+# //! &quot;#
+# //!         );
+# //!     }
+# //! #    else {
+# //! #        unreachable!();
+# //! #    }
+# //! }
+# //! ~~~
+# 
+# use std::any::TypeId;
+# use std::error::Error;
+# use std::fmt::{Debug, Display, Formatter, Result};
+# 
+# /// chains an inner error kind `T` with a causing error
+# pub struct ChainError&lt;T&gt; {
+#     #[cfg(not(feature = &quot;no-fileline&quot;))]
+#     occurrence: Option&lt;(u32, &amp;'static str)&gt;,
+#     kind: T,
+#     error_cause: Option&lt;Box&lt;dyn Error + 'static&gt;&gt;,
+# }
+# 
+# /// convenience type alias
+# pub type ChainResult&lt;O, E&gt; = std::result::Result&lt;O, ChainError&lt;E&gt;&gt;;
+# 
+# impl&lt;T: 'static + Display + Debug&gt; ChainError&lt;T&gt; {
+#     #[cfg(not(feature = &quot;no-fileline&quot;))]
+#     /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly
+#     pub fn new(
+#         kind: T,
+#         error_cause: Option&lt;Box&lt;dyn Error + 'static&gt;&gt;,
+#         occurrence: Option&lt;(u32, &amp;'static str)&gt;,
+#     ) -&gt; Self {
+#         Self {
+#             occurrence,
+#             kind,
+#             error_cause,
+#         }
+#     }
+# 
+#     #[cfg(feature = &quot;no-fileline&quot;)]
+#     /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly
+#     pub fn new(
+#         kind: T,
+#         error_cause: Option&lt;Box&lt;dyn Error + 'static&gt;&gt;,
+#         _occurrence: Option&lt;(u32, &amp;'static str)&gt;,
+#     ) -&gt; Self {
+#         Self { kind, error_cause }
+#     }
+# 
+#     /// return the root cause of the error chain, if any exists
+#     pub fn root_cause(&amp;self) -&gt; Option&lt;&amp;(dyn Error + 'static)&gt; {
+#         self.iter().last()
+#     }
+# 
+#     /// Find the first error cause of type U, if any exists
+#     ///
+#     /// # Examples
+#     ///
+#     /// ~~~rust
+#     /// # use crate::chainerror::*;
+#     /// # use std::error::Error;
+#     /// # use std::io;
+#     /// # use std::result::Result;
+#     /// #
+#     /// fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     Err(io::Error::from(io::ErrorKind::NotFound))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// derive_str_cherr!(Func2Error);
+#     ///
+#     /// fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     let filename = &quot;foo.txt&quot;;
+#     ///     do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// derive_str_cherr!(Func1Error);
+#     ///
+#     /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     func2().map_err(mstrerr!(Func1Error, &quot;func1 error&quot;))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// fn main() {
+#     ///     if let Err(e) = func1() {
+#     ///         if let Some(f1err) = e.downcast_chain_ref::&lt;Func1Error&gt;() {
+#     ///
+#     ///             assert!(f1err.find_cause::&lt;io::Error&gt;().is_some());
+#     ///
+#     ///             assert!(f1err.find_chain_cause::&lt;Func2Error&gt;().is_some());
+#     ///         }
+#     /// #        else {
+#     /// #            panic!();
+#     /// #        }
+#     ///     }
+#     /// #    else {
+#     /// #         unreachable!();
+#     /// #    }
+#     /// }
+#     /// ~~~
+#     pub fn find_cause&lt;U: Error + 'static&gt;(&amp;self) -&gt; Option&lt;&amp;U&gt; {
+#         self.iter().filter_map(Error::downcast_ref::&lt;U&gt;).next()
+#     }
+# 
+#     /// Find the first error cause of type `ChainError&lt;U&gt;`, if any exists
+#     ///
+#     /// Same as `find_cause`, but hides the `ChainError&lt;U&gt;` implementation internals
+#     ///
+#     /// # Examples
+#     ///
+#     /// ~~~rust,ignore
+#     /// // Instead of writing
+#     /// err.find_cause::&lt;ChainError&lt;FooError&gt;&gt;();
+#     ///
+#     /// // leave out the ChainError&lt;FooError&gt; implementation detail
+#     /// err.find_chain_cause::&lt;FooError&gt;();
+#     /// ~~~
+#     pub fn find_chain_cause&lt;U: Error + 'static&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;U&gt;&gt; {
+#         self.iter()
+#             .filter_map(Error::downcast_ref::&lt;ChainError&lt;U&gt;&gt;)
+#             .next()
+#     }
+# 
+#     /// Find the first error cause of type `ChainError&lt;U&gt;` or `U`, if any exists and return `U`
+#     ///
+#     /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError&lt;U&gt;` implementation internals
+#     ///
+#     /// # Examples
+#     ///
+#     /// ~~~rust,ignore
+#     /// // Instead of writing
+#     /// err.find_cause::&lt;ChainError&lt;FooErrorKind&gt;&gt;();
+#     /// // and/or
+#     /// err.find_chain_cause::&lt;FooErrorKind&gt;();
+#     /// // and/or
+#     /// err.find_cause::&lt;FooErrorKind&gt;();
+#     ///
+#     /// // leave out the ChainError&lt;FooErrorKind&gt; implementation detail
+#     /// err.find_chain_or_kind::&lt;FooErrorKind&gt;();
+#     /// ~~~
+#     pub fn find_kind_or_cause&lt;U: Error + 'static&gt;(&amp;self) -&gt; Option&lt;&amp;U&gt; {
+#         self.iter()
+#             .filter_map(|e| {
+#                 e.downcast_ref::&lt;ChainError&lt;U&gt;&gt;()
+#                     .map(|e| e.kind())
+#                     .or_else(|| e.downcast_ref::&lt;U&gt;())
+#             })
+#             .next()
+#     }
+# 
+#     /// Return a reference to T of `ChainError&lt;T&gt;`
+#     ///
+#     /// # Examples
+#     ///
+#     /// ~~~rust
+#     /// # use crate::chainerror::*;
+#     /// # use std::error::Error;
+#     /// # use std::io;
+#     /// # use std::result::Result;
+#     /// #
+#     /// fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     Err(io::Error::from(io::ErrorKind::NotFound))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// derive_str_cherr!(Func2Error);
+#     ///
+#     /// fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     let filename = &quot;foo.txt&quot;;
+#     ///     do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// #[derive(Debug)]
+#     /// enum Func1ErrorKind {
+#     ///     Func2,
+#     ///     IO(String),
+#     /// }
+#     ///
+#     /// /// impl ::std::fmt::Display for Func1ErrorKind {…}
+#     /// # impl ::std::fmt::Display for Func1ErrorKind {
+#     /// #     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+#     /// #         match self {
+#     /// #             Func1ErrorKind::Func2 =&gt; write!(f, &quot;func1 error calling func2&quot;),
+#     /// #             Func1ErrorKind::IO(filename) =&gt; write!(f, &quot;Error reading '{}'&quot;, filename),
+#     /// #         }
+#     /// #     }
+#     /// # }
+#     ///
+#     /// fn func1() -&gt; ChainResult&lt;(), Func1ErrorKind&gt; {
+#     ///     func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;
+#     ///     do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(&quot;bar.txt&quot;.into())))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// fn main() {
+#     ///     if let Err(e) = func1() {
+#     ///         match e.kind() {
+#     ///             Func1ErrorKind::Func2 =&gt; {},
+#     ///             Func1ErrorKind::IO(filename) =&gt; panic!(),
+#     ///         }
+#     ///     }
+#     /// #    else {
+#     /// #         unreachable!();
+#     /// #    }
+#     /// }
+#     /// ~~~
+#     pub fn kind(&amp;self) -&gt; &amp;T {
+#         &amp;self.kind
+#     }
+# 
+#     /// Returns an Iterator over all error causes/sources
+#     ///
+#     /// # Example
+#     ///
+#     ///
+#     pub fn iter(&amp;self) -&gt; impl Iterator&lt;Item = &amp;(dyn Error + 'static)&gt; {
+#         ErrorIter {
+#             current: Some(self),
+#         }
+#     }
+# }
+# 
+# struct ErrorIter&lt;'a&gt; {
+#     current: Option&lt;&amp;'a (dyn Error + 'static)&gt;,
+# }
+# 
+# impl&lt;'a&gt; Iterator for ErrorIter&lt;'a&gt; {
+#     type Item = &amp;'a (dyn Error + 'static);
+# 
+#     fn next(&amp;mut self) -&gt; Option&lt;Self::Item&gt; {
+#         let current = self.current;
+#         self.current = self.current.and_then(Error::source);
+#         current
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; std::ops::Deref for ChainError&lt;T&gt; {
+#     type Target = T;
+# 
+#     fn deref(&amp;self) -&gt; &amp;Self::Target {
+#         &amp;self.kind
+#     }
+# }
+# 
+# /// Convenience trait to hide the `ChainError&lt;T&gt;` implementation internals
+# pub trait ChainErrorDown {
+#     /// Test if of type `ChainError&lt;T&gt;`
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool;
+#     /// Downcast to a reference of `ChainError&lt;T&gt;`
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt;;
+#     /// Downcast to a mutable reference of `ChainError&lt;T&gt;`
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt;;
+# }
+# 
+# impl&lt;U: 'static + Display + Debug&gt; ChainErrorDown for ChainError&lt;U&gt; {
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool {
+#         TypeId::of::&lt;T&gt;() == TypeId::of::&lt;U&gt;()
+#     }
+# 
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt; {
+#         if self.is_chain::&lt;T&gt;() {
+#             #[allow(clippy::cast_ptr_alignment)]
+#             unsafe {
+#                 Some(&amp;*(self as *const dyn Error as *const &amp;ChainError&lt;T&gt;))
+#             }
+#         } else {
+#             None
+#         }
+#     }
+# 
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt; {
+#         if self.is_chain::&lt;T&gt;() {
+#             #[allow(clippy::cast_ptr_alignment)]
+#             unsafe {
+#                 Some(&amp;mut *(self as *mut dyn Error as *mut &amp;mut ChainError&lt;T&gt;))
+#             }
+#         } else {
+#             None
+#         }
+#     }
+# }
+# 
+# impl ChainErrorDown for dyn Error + 'static {
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool {
+#         self.is::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt; {
+#         self.downcast_ref::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt; {
+#         self.downcast_mut::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# }
+# 
+# impl ChainErrorDown for dyn Error + 'static + Send {
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool {
+#         self.is::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt; {
+#         self.downcast_ref::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt; {
+#         self.downcast_mut::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# }
+# 
+# impl ChainErrorDown for dyn Error + 'static + Send + Sync {
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool {
+#         self.is::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt; {
+#         self.downcast_ref::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt; {
+#         self.downcast_mut::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Error for ChainError&lt;T&gt; {
+#     fn source(&amp;self) -&gt; Option&lt;&amp;(dyn Error + 'static)&gt; {
+#         self.error_cause.as_ref().map(|e| e.as_ref())
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Error for &amp;ChainError&lt;T&gt; {
+#     fn source(&amp;self) -&gt; Option&lt;&amp;(dyn Error + 'static)&gt; {
+#         self.error_cause.as_ref().map(|e| e.as_ref())
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Error for &amp;mut ChainError&lt;T&gt; {
+#     fn source(&amp;self) -&gt; Option&lt;&amp;(dyn Error + 'static)&gt; {
+#         self.error_cause.as_ref().map(|e| e.as_ref())
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Display for ChainError&lt;T&gt; {
+#     fn fmt(&amp;self, f: &amp;mut Formatter) -&gt; Result {
+#         write!(f, &quot;{}&quot;, self.kind)?;
+# 
+#         #[cfg(feature = &quot;display-cause&quot;)]
+#         {
+#             if let Some(e) = self.source() {
+#                 writeln!(f, &quot;\nCaused by:&quot;)?;
+#                 Display::fmt(&amp;e, f)?;
+#             }
+#         }
+#         Ok(())
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Debug for ChainError&lt;T&gt; {
+#     fn fmt(&amp;self, f: &amp;mut Formatter) -&gt; Result {
+#         #[cfg(not(feature = &quot;no-fileline&quot;))]
+#         {
+#             if let Some(o) = self.occurrence {
+#                 write!(f, &quot;{}:{}: &quot;, o.1, o.0)?;
+#             }
+#         }
+# 
+#         if self.is_chain::&lt;String&gt;() {
+#             Display::fmt(&amp;self.kind, f)?;
+#         } else {
+#             Debug::fmt(&amp;self.kind, f)?;
+#         }
+# 
+#         #[cfg(not(feature = &quot;no-debug-cause&quot;))]
+#         {
+#             if let Some(e) = self.source() {
+#                 writeln!(f, &quot;\nCaused by:&quot;)?;
+#                 Debug::fmt(&amp;e, f)?;
+#             }
+#         }
+#         Ok(())
+#     }
+# }
+# 
+# pub trait ChainErrorFrom&lt;T&gt;: Sized {
+#     fn chain_error_from(_: T, line_filename: Option&lt;(u32, &amp;'static str)&gt;) -&gt; ChainError&lt;Self&gt;;
+# }
+# 
+# pub trait IntoChainError&lt;T&gt;: Sized {
+#     fn into_chain_error(self, line_filename: Option&lt;(u32, &amp;'static str)&gt;) -&gt; ChainError&lt;T&gt;;
+# }
+# 
+# impl&lt;T, U&gt; IntoChainError&lt;U&gt; for T
+# where
+#     U: ChainErrorFrom&lt;T&gt;,
+# {
+#     fn into_chain_error(self, line_filename: Option&lt;(u32, &amp;'static str)&gt;) -&gt; ChainError&lt;U&gt; {
+#         U::chain_error_from(self, line_filename)
+#     }
+# }
+# 
+# impl&lt;T, U&gt; ChainErrorFrom&lt;T&gt; for U
+# where
+#     T: Into&lt;U&gt;,
+#     U: 'static + Display + Debug,
+# {
+#     fn chain_error_from(t: T, line_filename: Option&lt;(u32, &amp;'static str)&gt;) -&gt; ChainError&lt;Self&gt; {
+#         let e: U = t.into();
+#         ChainError::&lt;_&gt;::new(e, None, line_filename)
+#     }
+# }
+# 
+# #[macro_export]
+# macro_rules! minto_cherr {
+#     ( ) =&gt; {
+#         |e| e.into_chain_error(Some((line!(), file!())))
+#     };
+# }
+# 
+# #[macro_export]
+# macro_rules! into_cherr {
+#     ( $t:expr ) =&gt; {
+#         $t.into_chain_error(Some((line!(), file!())))
+#     };
+# }
+# 
+# /// Creates a new `ChainError&lt;T&gt;`
+# ///
+# /// # Examples
+# ///
+# /// Create a new ChainError&lt;FooError&gt;, where `FooError` must implement `Display` and `Debug`.
+# /// ~~~rust
+# /// # use chainerror::*;
+# /// #
+# /// # #[derive(Debug)]
+# /// enum FooError {
+# ///     Bar,
+# ///     Baz(&amp;'static str),
+# /// }
+# /// #
+# /// # impl ::std::fmt::Display for FooError {
+# /// #     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+# /// #         match self {
+# /// #             FooError::Bar =&gt; write!(f, &quot;Bar Error&quot;),
+# /// #             FooError::Baz(s) =&gt; write!(f, &quot;Baz Error: '{}'&quot;, s),
+# /// #         }
+# /// #     }
+# /// # }
+# ///
+# /// //  impl ::std::fmt::Display for FooError
+# ///
+# /// fn do_some_stuff() -&gt; bool {
+# ///     false
+# /// }
+# ///
+# /// fn func() -&gt; ChainResult&lt;(), FooError&gt; {
+# ///     if ! do_some_stuff() {
+# ///         Err(cherr!(FooError::Baz(&quot;Error&quot;)))?;
+# ///     }
+# ///     Ok(())
+# /// }
+# /// #
+# /// # pub fn main() {
+# /// #     match func().unwrap_err().kind() {
+# /// #         FooError::Baz(s) if s == &amp;&quot;Error&quot; =&gt; {},
+# /// #         _ =&gt; panic!(),
+# /// #     }
+# /// # }
+# /// ~~~
+# ///
+# /// Additionally an error cause can be added.
+# ///
+# /// ~~~rust
+# /// # use chainerror::*;
+# /// # use std::io;
+# /// # use std::error::Error;
+# /// #
+# /// # #[derive(Debug)]
+# /// # enum FooError {
+# /// #     Bar,
+# /// #     Baz(&amp;'static str),
+# /// # }
+# /// #
+# /// # impl ::std::fmt::Display for FooError {
+# /// #     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+# /// #         match self {
+# /// #             FooError::Bar =&gt; write!(f, &quot;Bar Error&quot;),
+# /// #             FooError::Baz(s) =&gt; write!(f, &quot;Baz Error: '{}'&quot;, s),
+# /// #         }
+# /// #     }
+# /// # }
+# /// #
+# /// fn do_some_stuff() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// fn func() -&gt; ChainResult&lt;(), FooError&gt; {
+# ///     do_some_stuff().map_err(
+# ///         |e| cherr!(e, FooError::Baz(&quot;Error&quot;))
+# ///     )?;
+# ///     Ok(())
+# /// }
+# /// #
+# /// # pub fn main() {
+# /// #     match func().unwrap_err().kind() {
+# /// #         FooError::Baz(s) if s == &amp;&quot;Error&quot; =&gt; {},
+# /// #         _ =&gt; panic!(),
+# /// #     }
+# /// # }
+# /// ~~~
+# #[macro_export]
+# macro_rules! cherr {
+#     ( $k:expr ) =&gt; ({
+#         ChainError::&lt;_&gt;::new($k, None, Some((line!(), file!())))
+#     });
+#     ( None, $k:expr ) =&gt; ({
+#         ChainError::&lt;_&gt;::new($k, None, Some((line!(), file!())))
+#     });
+#     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         cherr!(None, format!($fmt, $($arg)+ ))
+#     });
+#     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         cherr!(None, format!($fmt, $($arg)+ ))
+#     });
+#     ( $e:path, $k:expr ) =&gt; ({
+#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
+#     });
+#     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         cherr!($e, format!($fmt, $($arg)+ ))
+#     });
+# 
+# }
+# 
+# /// Convenience macro for `|e| cherr!(e, format!(…))`
+# ///
+# /// # Examples
+# ///
+# /// ~~~rust
+# /// # use crate::chainerror::*;
+# /// # use std::error::Error;
+# /// # use std::io;
+# /// # use std::result::Result;
+# /// #
+# /// # fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# /// #     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# /// #     Ok(())
+# /// # }
+# /// #
+# /// fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     let filename = &quot;foo.txt&quot;;
+# ///     do_some_io().map_err(mstrerr!(&quot;Error reading '{}'&quot;, filename))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     func2().map_err(mstrerr!(&quot;func1 error&quot;))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// # fn main() {
+# /// #     if let Err(e) = func1() {
+# /// #         #[cfg(not(windows))]
+# /// #         assert_eq!(
+# /// #             format!(&quot;\n{:?}\n&quot;, e), r#&quot;
+# /// # src/lib.rs:20: func1 error
+# /// # Caused by:
+# /// # src/lib.rs:15: Error reading 'foo.txt'
+# /// # Caused by:
+# /// # Kind(NotFound)
+# /// # &quot;#
+# /// #         );
+# /// #     } else {
+# /// #         unreachable!();
+# /// #     }
+# /// # }
+# /// ~~~
+# ///
+# /// `mstrerr!()` can also be used to map a new `ChainError&lt;T&gt;`, where T was defined with
+# /// `derive_str_cherr!(T)`
+# ///
+# /// ~~~rust
+# /// # use crate::chainerror::*;
+# /// # use std::error::Error;
+# /// # use std::io;
+# /// # use std::result::Result;
+# /// #
+# /// # fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# /// #     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# /// #     Ok(())
+# /// # }
+# /// #
+# /// derive_str_cherr!(Func2Error);
+# ///
+# /// fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     let filename = &quot;foo.txt&quot;;
+# ///     do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// derive_str_cherr!(Func1Error);
+# ///
+# /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     func2().map_err(mstrerr!(Func1Error, &quot;func1 error&quot;))?;
+# ///     Ok(())
+# /// }
+# /// #
+# /// # fn main() {
+# /// #     if let Err(e) = func1() {
+# /// #         if let Some(f1err) = e.downcast_chain_ref::&lt;Func1Error&gt;() {
+# /// #             assert!(f1err.find_cause::&lt;ChainError&lt;Func2Error&gt;&gt;().is_some());
+# /// #             assert!(f1err.find_chain_cause::&lt;Func2Error&gt;().is_some());
+# /// #         } else {
+# /// #             panic!();
+# /// #         }
+# /// #     } else {
+# /// #         unreachable!();
+# /// #     }
+# /// # }
+# /// ~~~
+# #[macro_export]
+# macro_rules! mstrerr {
+#     ( $t:path, $msg:expr ) =&gt; ({
+#         |e| cherr!(e, $t ($msg.to_string()))
+#     });
+#     ( $t:path, $msg:expr, ) =&gt; ({
+#         |e| cherr!(e, $t ($msg.to_string()))
+#     });
+#     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
+#     });
+#     ($msg:expr) =&gt; ({
+#         |e| cherr!(e, $msg.to_string())
+#     });
+#     ($msg:expr, ) =&gt; ({
+#         |e| cherr!(e, $msg.to_string())
+#     });
+#     ($fmt:expr, $($arg:tt)+) =&gt; ({
+#         |e| cherr!(e, format!($fmt, $($arg)+ ))
+#     });
+# }
+# 
+# /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`
+# ///
+# /// # Examples
+# ///
+# /// ~~~rust
+# /// # use crate::chainerror::*;
+# /// # use std::error::Error;
+# /// # use std::result::Result;
+# /// #
+# /// derive_str_cherr!(Func2Error);
+# ///
+# /// fn func2() -&gt; ChainResult&lt;(), Func2Error&gt; {
+# ///     let filename = &quot;foo.txt&quot;;
+# ///     Err(strerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))
+# /// }
+# ///
+# /// derive_str_cherr!(Func1Error);
+# ///
+# /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     func2().map_err(mstrerr!(Func1Error, &quot;func1 error&quot;))?;
+# ///     Ok(())
+# /// }
+# /// #
+# /// # fn main() {
+# /// #     if let Err(e) = func1() {
+# /// #         if let Some(f1err) = e.downcast_chain_ref::&lt;Func1Error&gt;() {
+# /// #             assert!(f1err.find_cause::&lt;ChainError&lt;Func2Error&gt;&gt;().is_some());
+# /// #             assert!(f1err.find_chain_cause::&lt;Func2Error&gt;().is_some());
+# /// #         } else {
+# /// #             panic!();
+# /// #         }
+# /// #     } else {
+# /// #         unreachable!();
+# /// #     }
+# /// # }
+# /// ~~~
+# #[macro_export]
+# macro_rules! strerr {
+#     ( $t:path, $msg:expr ) =&gt; ({
+#         cherr!($t ($msg.to_string()))
+#     });
+#     ( $t:path, $msg:expr, ) =&gt; ({
+#         cherr!($t ($msg.to_string()))
+#     });
+#     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         cherr!($t (format!($fmt, $($arg)+ )))
+#     });
+#     ($msg:expr) =&gt; ({
+#         cherr!($msg.to_string())
+#     });
+#     ($msg:expr, ) =&gt; ({
+#         cherr!($msg.to_string())
+#     });
+#     ($fmt:expr, $($arg:tt)+) =&gt; ({
+#         cherr!(format!($fmt, $($arg)+ ))
+#     });
+# }
+# 
+# /// Convenience macro to create a &quot;new type&quot; T(String) and implement Display + Debug for T
+# ///
+# /// # Examples
+# ///
+# /// ~~~rust
+# /// # use crate::chainerror::*;
+# /// # use std::error::Error;
+# /// # use std::io;
+# /// # use std::result::Result;
+# /// #
+# /// # fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# /// #     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# /// #     Ok(())
+# /// # }
+# /// #
+# /// derive_str_cherr!(Func2Error);
+# ///
+# /// fn func2() -&gt; ChainResult&lt;(), Func2Error&gt; {
+# ///     let filename = &quot;foo.txt&quot;;
+# ///     do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// derive_str_cherr!(Func1Error);
+# ///
+# /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     func2().map_err(mstrerr!(Func1Error, &quot;func1 error&quot;))?;
+# ///     Ok(())
+# /// }
+# /// #
+# /// # fn main() {
+# /// #     if let Err(e) = func1() {
+# /// #         if let Some(f1err) = e.downcast_chain_ref::&lt;Func1Error&gt;() {
+# /// #             assert!(f1err.find_cause::&lt;ChainError&lt;Func2Error&gt;&gt;().is_some());
+# /// #             assert!(f1err.find_chain_cause::&lt;Func2Error&gt;().is_some());
+# /// #         } else {
+# /// #             panic!();
+# /// #         }
+# /// #     } else {
+# /// #         unreachable!();
+# /// #     }
+# /// # }
+# /// ~~~
+# #[macro_export]
+# macro_rules! derive_str_cherr {
+#     ($e:ident) =&gt; {
+#         pub struct $e(pub String);
+#         impl ::std::fmt::Display for $e {
+#             fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+#                 write!(f, &quot;{}&quot;, self.0)
+#             }
+#         }
+#         impl ::std::fmt::Debug for $e {
+#             fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+#                 write!(f, &quot;{}({})&quot;, stringify!($e), self.0)
+#             }
+#         }
+#         impl ::std::error::Error for $e {}
+#     };
+# }
+# }
+pub mod mycrate {
+    use crate::chainerror::*; // omit the `crate::` part
+    use std::io;
+
+    fn do_some_io() -&gt; std::result::Result&lt;(), Box&lt;std::error::Error&gt;&gt; {
+        Err(io::Error::from(io::ErrorKind::NotFound))?;
+        Ok(())
+    }
+
+    derive_str_cherr!(Func2Error);
+
+    fn func2() -&gt; std::result::Result&lt;(), Box&lt;std::error::Error&gt;&gt; {
+        let filename = &quot;foo.txt&quot;;
+        do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+        Ok(())
+    }
+
+    #[derive(Debug)]
+    pub enum ErrorKind {
+        Func2,
+        IO(String),
+    }
+
+    pub type Error = ChainError&lt;ErrorKind&gt;;
+    pub type Result&lt;T&gt; = std::result::Result&lt;T, Error&gt;;
+
+    impl ::std::fmt::Display for ErrorKind {
+        fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+            match self {
+                ErrorKind::Func2 =&gt; write!(f, &quot;func1 error calling func2&quot;),
+                ErrorKind::IO(filename) =&gt; write!(f, &quot;Error reading '{}'&quot;, filename),
+            }
+        }
+    }
+
+    pub fn func1() -&gt; Result&lt;()&gt; {
+        func2().map_err(|e| cherr!(e, ErrorKind::Func2))?;
+        let filename = String::from(&quot;bar.txt&quot;);
+        do_some_io().map_err(|e| cherr!(e, ErrorKind::IO(filename)))?;
+        Ok(())
+    }
+}
+
+fn main() -&gt; Result&lt;(), Box&lt;std::error::Error&gt;&gt; {
+    use mycrate::func1;
+    use mycrate::ErrorKind;
+    use std::error::Error;
+    use std::io;
+
+    if let Err(e) = func1() {
+        match e.kind() {
+            ErrorKind::Func2 =&gt; eprintln!(&quot;Main Error Report: func1 error calling func2&quot;),
+            ErrorKind::IO(ref filename) =&gt; {
+                eprintln!(&quot;Main Error Report: func1 error reading '{}'&quot;, filename)
+            }
+        }
+
+        eprintln!();
+        let mut s : &amp;Error = &amp;e;
+        while let Some(c) = s.source() {
+            if let Some(ioerror) = c.downcast_ref::&lt;io::Error&gt;() {
+                eprintln!(&quot;caused by: std::io::Error: {}&quot;, ioerror);
+                match ioerror.kind() {
+                    io::ErrorKind::NotFound =&gt; eprintln!(&quot;of kind: std::io::ErrorKind::NotFound&quot;),
+                    _ =&gt; {}
+                }
+            } else {
+                eprintln!(&quot;caused by: {}&quot;, c);
+            }
+            s = c;
+        }
+
+        eprintln!(&quot;\nDebug Error:\n{:?}&quot;, e);
+    }
+    Ok(())
+}
+</code></pre></pre>
 <a class="header" href="#the-end" id="the-end"><h1>The End</h1></a>
 <p>That's it for now…</p>
 <p>Happy error handling!</p>
diff --git a/searchindex.js b/searchindex.js
index c8a11e5..056a08d 100644
--- a/searchindex.js
+++ b/searchindex.js
@@ -1 +1 @@
-window.search = {"doc_urls":["index.html#chainerror","index.html#example","index.html#features","tutorial1.html#simple-string-errors","tutorial2.html#simple-chained-string-errors","tutorial2.html#what-did-we-do-here","tutorial3.html#mapping-errors","tutorial4.html#saving-coding-chars","tutorial5.html#the-source-of-errors","tutorial6.html#downcast-the-errors","tutorial7.html#the-root-cause-of-all-errors","tutorial8.html#finding-an-error-cause","tutorial9.html#selective-error-handling","tutorial10.html#errorkind-to-the-rescue","tutorial11.html#debug-for-the-errorkind","tutorial12.html#deref-for-the-errorkind","end.html#the-end"],"index":{"documentStore":{"docInfo":{"0":{"body":60,"breadcrumbs":1,"title":1},"1":{"body":170,"breadcrumbs":1,"title":1},"10":{"body":1661,"breadcrumbs":3,"title":3},"11":{"body":1628,"breadcrumbs":3,"title":3},"12":{"body":1642,"breadcrumbs":3,"title":3},"13":{"body":1699,"breadcrumbs":2,"title":2},"14":{"body":1705,"breadcrumbs":2,"title":2},"15":{"body":1685,"breadcrumbs":2,"title":2},"16":{"body":18,"breadcrumbs":1,"title":1},"2":{"body":20,"breadcrumbs":1,"title":1},"3":{"body":94,"breadcrumbs":3,"title":3},"4":{"body":1599,"breadcrumbs":4,"title":4},"5":{"body":44,"breadcrumbs":1,"title":1},"6":{"body":1617,"breadcrumbs":2,"title":2},"7":{"body":1603,"breadcrumbs":3,"title":3},"8":{"body":1616,"breadcrumbs":2,"title":2},"9":{"body":1626,"breadcrumbs":2,"title":2}},"docs":{"0":{"body":"Build Status Crate Rust Documentation chainerror provides an error backtrace like failure without doing a real backtrace, so even after you strip your binaries, you still have the error backtrace. chainerror has no dependencies! chainerror uses .source() of std::error::Error along with line()! and file()! to provide a nice debug error backtrace. It encapsulates all types, which have Display + Debug and can store the error cause internally. Along with the ChainError<T> struct, chainerror comes with some useful helper macros to save a lot of typing. Debug information is worth it! Now continue reading the Tutorial","breadcrumbs":"chainerror","id":"0","title":"chainerror"},"1":{"body":"Output: $ cargo run -q --example example\nMain Error Report: func1 error calling func2 Error reported by Func2Error: func2 error: calling func3 The root cause was: std::io::Error: Kind( NotFound\n) Debug Error:\nexamples/example.rs:45: func1 error calling func2\nCaused by:\nexamples/example.rs:20: Func2Error(func2 error: calling func3)\nCaused by:\nexamples/example.rs:13: Error reading 'foo.txt'\nCaused by:\nKind(NotFound) use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func3() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> ChainResult<(), Func2Error> { func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?; Ok(())\n} enum Func1Error { Func2, IO(String),\n} impl ::std::fmt::Display for Func1Error { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1Error::Func2 => write!(f, \"func1 error calling func2\"), Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1Error { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} fn func1() -> ChainResult<(), Func1Error> { func2().map_err(|e| cherr!(e, Func1Error::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?; Ok(())\n} fn main() { if let Err(e) = func1() { match e.kind() { Func1Error::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1Error::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } if let Some(e) = e.root_cause() { let ioerror = e.downcast_ref::<io::Error>().unwrap(); eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror); } eprintln!(\"\\nDebug Error:\\n{:?}\", e); }\n}","breadcrumbs":"Example:","id":"1","title":"Example:"},"10":{"body":"chainerror also has some helper methods: fn is_chain<T: 'static + Display + Debug>(&self) -> bool\nfn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>\nfn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>\nfn root_cause(&self) -> Option<&(dyn Error + 'static)>\nfn find_cause<U: Error + 'static>(&self) -> Option<&U>\nfn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>>\nfn kind<'a>(&'a self) -> &'a T Using downcast_chain_ref::<String>() gives a ChainError<String> , which can be used to call .find_cause::<io::Error>() . if let Some(s) = e.downcast_chain_ref::<String>() { if let Some(ioerror) = s.find_cause::<io::Error>() { or to use .root_cause() , which of course can be of any type implementing std::error::Error . if let Some(e) = s.root_cause() { use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"Error: {}\", e); if let Some(s) = e.downcast_chain_ref::<String>() { if let Some(ioerror) = s.find_cause::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } if let Some(e) = s.root_cause() { let ioerror = e.downcast_ref::<io::Error>().unwrap(); eprintln!(\"The root cause was: std::io::Error: {:#?}\", ioerror); } } } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"The root cause of all Errors","id":"10","title":"The root cause of all Errors"},"11":{"body":"To distinguish the errors occuring in various places, we can define named string errors with the \"new type\" pattern. derive_str_cherr!(Func2Error);\nderive_str_cherr!(Func1Error); Instead of ChainError<String> we now have struct Func1Error(String) and ChainError<Func1Error> . In the main function you can see, how we can match the different errors. Also see: if let Some(f2err) = f1err.find_chain_cause::<Func2Error>() { as a shortcut to if let Some(f2err) = f1err.find_cause::<ChainError<Func2Error>>() { hiding the ChainError<T> implementation detail. use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func1Error); fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() { eprintln!(\"Func1Error: {}\", f1err); if let Some(f2err) = f1err.find_cause::<ChainError<Func2Error>>() { eprintln!(\"Func2Error: {}\", f2err); } if let Some(f2err) = f1err.find_chain_cause::<Func2Error>() { eprintln!(\"Debug Func2Error:\\n{:?}\", f2err); } } } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Finding an Error cause","id":"11","title":"Finding an Error cause"},"12":{"body":"What about functions returning different Error types? In this example func1() can return either Func1ErrorFunc2 or Func1ErrorIO . We might want to match on func1() with something like: fn main() -> Result<(), Box<Error>> { match func1() { Err(e) if let Some(s) = e.downcast_chain_ref::<Func1ErrorIO>() => eprintln!(\"Func1ErrorIO:\\n{:?}\", s), Err(e) if let Some(s) = e.downcast_chain_ref::<Func1ErrorFunc2>() => eprintln!(\"Func1ErrorFunc2:\\n{:?}\", s), Ok(_) => {}, } Ok(())\n} but this is not valid rust code, so we end up doing it the hard way. In the next chapter, we will see, how to solve this more elegantly. use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func1ErrorFunc2);\nderive_str_cherr!(Func1ErrorIO); fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(Func1ErrorFunc2, \"func1 error calling func2\"))?; let filename = \"bar.txt\"; do_some_io().map_err(mstrerr!(Func1ErrorIO, \"Error reading '{}'\", filename))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { if let Some(s) = e.downcast_ref::<ChainError<Func1ErrorIO>>() { eprintln!(\"Func1ErrorIO:\\n{:?}\", s); } if let Some(s) = e.downcast_chain_ref::<Func1ErrorFunc2>() { eprintln!(\"Func1ErrorFunc2:\\n{:?}\", s); } } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Selective Error Handling","id":"12","title":"Selective Error Handling"},"13":{"body":"To cope with different kind of errors, we introduce the kind of an error Func1ErrorKind with an enum. Because we derive Debug and implement Display our Func1ErrorKind enum, this enum can be used as a std::error::Error . Not using String errors anymore, the cherr!() macro seen in the beginning of the tutorial has to be used again. Only returning Func1ErrorKind in func1() now let us get rid of Result<(), Box<Error>> and we can use ChainResult<(), Func1ErrorKind> . In main we can now directly use the methods of ChainError<T> without downcasting the error first. Also a nice match on ChainError<T>.kind() is now possible, which returns &T , meaning &Func1ErrorKind here. use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} #[derive(Debug)]\nenum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n}\nimpl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match e.kind() { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"ErrorKind to the rescue","id":"13","title":"ErrorKind to the rescue"},"14":{"body":"One small improvement at the end of the tutorial is to fix the debug output of Func1ErrorKind . As you probably noticed, the output doesn't say much of the enum. Debug Error:\nsrc/main.rs:35: Func2\n[…] As a lazy shortcut, we implement Debug by calling Display and end up with Debug Error:\nsrc/main.rs:40: func1 error calling func2\n[…} which gives us a lot more detail. To create your own Errors, you might find crates which create enum Display+Debug via derive macros. Also noteworthy is custom_error to define your custom errors, which can then be used with chainerror . use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} enum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} impl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match e.kind() { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Debug for the ErrorKind","id":"14","title":"Debug for the ErrorKind"},"15":{"body":"Because ChainError implements Deref to &T, we can also match on *e instead of e.kind() or call a function with &e use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} enum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} impl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn handle_func1errorkind(e: &Func1ErrorKind) { match e { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } }\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match *e { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } handle_func1errorkind(&e); if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Deref for the ErrorKind","id":"15","title":"Deref for the ErrorKind"},"16":{"body":"That's it for now… Happy error handling! To report issues, submit pull request or for the source code, examples and the book source, visit the Git Repo .","breadcrumbs":"The End","id":"16","title":"The End"},"2":{"body":"no-fileline : completely turn off storing filename and line display-cause : turn on printing a backtrace of the errors in Display no-debug-cause : turn off printing a backtrace of the errors in Debug","breadcrumbs":"Features","id":"2","title":"Features"},"3":{"body":"An easy way of doing error handling in rust is by returning String as a Box<std::error::Error> . If the rust main function returns an Err() , this Err() will be displayed with std::fmt::Debug . As you can see by running the example (by pressing the \"Play\" button in upper right of the code block), this only prints out the last Error . Error: StringError(\"func1 error\") The next chapters of this tutorial show how chainerror adds more information and improves inspecting the sources of an error. You can also run the tutorial examples in the checked out chainerror git repo . $ cargo run -q --example tutorial1 use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { if let Err(_) = do_some_io() { Err(\"func2 error\")?; } Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(_) = func2() { Err(\"func1 error\")?; } Ok(())\n} fn main() -> Result<(), Box<Error>> { func1()\n}","breadcrumbs":"Simple String Errors","id":"3","title":"Simple String Errors"},"4":{"body":"With relatively small changes and the help of the cherr! macro of the chainerror crate the String errors are now chained together. Press the play button in the upper right corner and see the nice debug output. use crate::chainerror::*; use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { if let Err(e) = do_some_io() { Err(cherr!(e, \"func2 error\"))?; } Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(e) = func2() { Err(cherr!(e, \"func1 error\"))?; } Ok(())\n} fn main() -> Result<(), Box<Error>> { func1()\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Simple Chained String Errors","id":"4","title":"Simple Chained String Errors"},"5":{"body":"if let Err(e) = do_some_io() { Err(cherr!(e, \"func2 error\"))?; } The macro cherr!(olderror, newerror) stores olderror as the source/cause of newerror along with the filename ( file!() ) and line number ( line!() ) and returns newerror . Err()? then returns the inner error applying .into() , so that we again have a Err(Box<Error>) as a result. The Debug implementation of ChainError<T> (which is returned by cherr!() ) prints the Debug of T prefixed with the stored filename and line number. ChainError<T> in our case is ChainError<String> .","breadcrumbs":"What did we do here?","id":"5","title":"What did we do here?"},"6":{"body":"Now let's get more rust idiomatic by using .map_err() . use crate::chainerror::*; use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { do_some_io().map_err(|e| cherr!(e, \"func2 error\"))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(|e| cherr!(e, \"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# } If you compare the output to the previous example, you will see, that: Error: src/main.rs:19: \"func1 error\" changed to just: src/main.rs:16: \"func1 error\" This is, because we caught the error of func1() in main() and print it out ourselves. We can now control, whether to output in Debug or Display mode. Maybe depending on --debug as a CLI argument.","breadcrumbs":"Mapping Errors","id":"6","title":"Mapping Errors"},"7":{"body":"Because decorating an error with more information should not let you jump through hoops, chainerror has a quick macro for that. mstrerror!() fits right into .map_err() letting you quickly add more debug strings. mstrerror!() even understands format!() syntax like println!() . use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Saving coding chars","id":"7","title":"Saving coding chars"},"8":{"body":"Sometimes you want to inspect the source() of an Error . chainerror implements std::error::Error::source() , so you can get the cause of an error. use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(e) = func2() { if let Some(s) = e.source() { eprintln!(\"func2 failed because of '{}'\", s); Err(e).map_err(mstrerr!(\"func1 error\"))?; } } Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# } Note, that because we changed the output of the error in main() from Debug to Display , we don't see the error backtrace with filename and line number. To enable the Display backtrace, you have to enable the feature display-cause for chainerror .","breadcrumbs":"The source() of Errors","id":"8","title":"The source() of Errors"},"9":{"body":"std::error::Error comes with some helper methods to get to the original object of the &(dyn Error + 'static) returned by .source() . pub fn downcast_ref<T: Error + 'static>(&self) -> Option<&T>\npub fn downcast_mut<T: Error + 'static>(&mut self) -> Option<&mut T> This is how it looks like, when using those: use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"Error: {}\", e); let mut s = e.as_ref(); while let Some(c) = s.source() { if let Some(ioerror) = c.downcast_ref::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } else { eprintln!(\"caused by: {}\", c); } s = c; } } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// 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=> ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> 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Now continue reading the Tutorial","breadcrumbs":"chainerror","id":"0","title":"chainerror"},"1":{"body":"Output: $ cargo run -q --example example\nMain Error Report: func1 error calling func2 Error reported by Func2Error: func2 error: calling func3 The root cause was: std::io::Error: Kind( NotFound\n) Debug Error:\nexamples/example.rs:45: func1 error calling func2\nCaused by:\nexamples/example.rs:20: Func2Error(func2 error: calling func3)\nCaused by:\nexamples/example.rs:13: Error reading 'foo.txt'\nCaused by:\nKind(NotFound) use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func3() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> ChainResult<(), Func2Error> { func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?; Ok(())\n} enum Func1Error { Func2, IO(String),\n} impl ::std::fmt::Display for Func1Error { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1Error::Func2 => write!(f, \"func1 error calling func2\"), Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1Error { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} fn func1() -> ChainResult<(), Func1Error> { func2().map_err(|e| cherr!(e, Func1Error::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?; Ok(())\n} fn main() { if let Err(e) = func1() { match e.kind() { Func1Error::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1Error::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } if let Some(e) = e.root_cause() { let ioerror = e.downcast_ref::<io::Error>().unwrap(); eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror); } eprintln!(\"\\nDebug Error:\\n{:?}\", e); }\n}","breadcrumbs":"Example:","id":"1","title":"Example:"},"10":{"body":"chainerror also has some helper methods: fn is_chain<T: 'static + Display + Debug>(&self) -> bool\nfn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>\nfn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>\nfn root_cause(&self) -> Option<&(dyn Error + 'static)>\nfn find_cause<U: Error + 'static>(&self) -> Option<&U>\nfn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>>\nfn kind<'a>(&'a self) -> &'a T Using downcast_chain_ref::<String>() gives a ChainError<String> , which can be used to call .find_cause::<io::Error>() . if let Some(s) = e.downcast_chain_ref::<String>() { if let Some(ioerror) = s.find_cause::<io::Error>() { or to use .root_cause() , which of course can be of any type implementing std::error::Error . if let Some(e) = s.root_cause() { use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"Error: {}\", e); if let Some(s) = e.downcast_chain_ref::<String>() { if let Some(ioerror) = s.find_cause::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } if let Some(e) = s.root_cause() { let ioerror = e.downcast_ref::<io::Error>().unwrap(); eprintln!(\"The root cause was: std::io::Error: {:#?}\", ioerror); } } } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"The root cause of all Errors","id":"10","title":"The root cause of all Errors"},"11":{"body":"To distinguish the errors occuring in various places, we can define named string errors with the \"new type\" pattern. derive_str_cherr!(Func2Error);\nderive_str_cherr!(Func1Error); Instead of ChainError<String> we now have struct Func1Error(String) and ChainError<Func1Error> . In the main function you can see, how we can match the different errors. Also see: if let Some(f2err) = f1err.find_chain_cause::<Func2Error>() { as a shortcut to if let Some(f2err) = f1err.find_cause::<ChainError<Func2Error>>() { hiding the ChainError<T> implementation detail. use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func1Error); fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() { eprintln!(\"Func1Error: {}\", f1err); if let Some(f2err) = f1err.find_cause::<ChainError<Func2Error>>() { eprintln!(\"Func2Error: {}\", f2err); } if let Some(f2err) = f1err.find_chain_cause::<Func2Error>() { eprintln!(\"Debug Func2Error:\\n{:?}\", f2err); } } } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Finding an Error cause","id":"11","title":"Finding an Error cause"},"12":{"body":"What about functions returning different Error types? In this example func1() can return either Func1ErrorFunc2 or Func1ErrorIO . We might want to match on func1() with something like: fn main() -> Result<(), Box<Error>> { match func1() { Err(e) if let Some(s) = e.downcast_chain_ref::<Func1ErrorIO>() => eprintln!(\"Func1ErrorIO:\\n{:?}\", s), Err(e) if let Some(s) = e.downcast_chain_ref::<Func1ErrorFunc2>() => eprintln!(\"Func1ErrorFunc2:\\n{:?}\", s), Ok(_) => {}, } Ok(())\n} but this is not valid rust code, so we end up doing it the hard way. In the next chapter, we will see, how to solve this more elegantly. use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func1ErrorFunc2);\nderive_str_cherr!(Func1ErrorIO); fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(Func1ErrorFunc2, \"func1 error calling func2\"))?; let filename = \"bar.txt\"; do_some_io().map_err(mstrerr!(Func1ErrorIO, \"Error reading '{}'\", filename))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { if let Some(s) = e.downcast_ref::<ChainError<Func1ErrorIO>>() { eprintln!(\"Func1ErrorIO:\\n{:?}\", s); } if let Some(s) = e.downcast_chain_ref::<Func1ErrorFunc2>() { eprintln!(\"Func1ErrorFunc2:\\n{:?}\", s); } } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Selective Error Handling","id":"12","title":"Selective Error Handling"},"13":{"body":"To cope with different kind of errors, we introduce the kind of an error Func1ErrorKind with an enum. Because we derive Debug and implement Display our Func1ErrorKind enum, this enum can be used as a std::error::Error . Not using String errors anymore, the cherr!() macro seen in the beginning of the tutorial has to be used again. Only returning Func1ErrorKind in func1() now let us get rid of Result<(), Box<Error>> and we can use ChainResult<(), Func1ErrorKind> . In main we can now directly use the methods of ChainError<T> without downcasting the error first. Also a nice match on ChainError<T>.kind() is now possible, which returns &T , meaning &Func1ErrorKind here. use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} #[derive(Debug)]\nenum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n}\nimpl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match e.kind() { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"ErrorKind to the rescue","id":"13","title":"ErrorKind to the rescue"},"14":{"body":"One small improvement at the end of the tutorial is to fix the debug output of Func1ErrorKind . As you probably noticed, the output doesn't say much of the enum. Debug Error:\nsrc/main.rs:35: Func2\n[…] As a lazy shortcut, we implement Debug by calling Display and end up with Debug Error:\nsrc/main.rs:40: func1 error calling func2\n[…} which gives us a lot more detail. To create your own Errors, you might find crates which create enum Display+Debug via derive macros. Also noteworthy is custom_error to define your custom errors, which can then be used with chainerror . use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} enum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} impl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match e.kind() { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Debug for the ErrorKind","id":"14","title":"Debug for the ErrorKind"},"15":{"body":"Because ChainError implements Deref to &T, we can also match on *e instead of e.kind() or call a function with &e use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} enum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} impl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn handle_func1errorkind(e: &Func1ErrorKind) { match e { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } }\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match *e { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } handle_func1errorkind(&e); if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Deref for the ErrorKind","id":"15","title":"Deref for the ErrorKind"},"16":{"body":"I would advise to only expose an mycrate::ErrorKind and type alias mycrate::Error to ChainError<mycrate::ErrorKind> so you can tell your library users to use the .kind() method as std::io::Error does. If you later decide to make your own Error implementation, your library users don't have to change much or anything. # #[allow(dead_code)]\n# #[macro_use]\n# pub mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }\npub mod mycrate { use crate::chainerror::*; // omit the `crate::` part use std::io; fn do_some_io() -> std::result::Result<(), Box<std::error::Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(()) } derive_str_cherr!(Func2Error); fn func2() -> std::result::Result<(), Box<std::error::Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(()) } #[derive(Debug)] pub enum ErrorKind { Func2, IO(String), } pub type Error = ChainError<ErrorKind>; pub type Result<T> = std::result::Result<T, Error>; impl ::std::fmt::Display for ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } } } pub fn func1() -> Result<()> { func2().map_err(|e| cherr!(e, ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, ErrorKind::IO(filename)))?; Ok(()) }\n} fn main() -> Result<(), Box<std::error::Error>> { use mycrate::func1; use mycrate::ErrorKind; use std::error::Error; use std::io; if let Err(e) = func1() { match e.kind() { ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } eprintln!(); let mut s : &Error = &e; while let Some(c) = s.source() { if let Some(ioerror) = c.downcast_ref::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } else { eprintln!(\"caused by: {}\", c); } s = c; } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n}","breadcrumbs":"Writing a library","id":"16","title":"Writing a library"},"17":{"body":"That's it for now… Happy error handling! To report issues, submit pull request or for the source code, examples and the book source, visit the Git Repo .","breadcrumbs":"The End","id":"17","title":"The End"},"2":{"body":"no-fileline : completely turn off storing filename and line display-cause : turn on printing a backtrace of the errors in Display no-debug-cause : turn off printing a backtrace of the errors in Debug","breadcrumbs":"Features","id":"2","title":"Features"},"3":{"body":"An easy way of doing error handling in rust is by returning String as a Box<std::error::Error> . If the rust main function returns an Err() , this Err() will be displayed with std::fmt::Debug . As you can see by running the example (by pressing the \"Play\" button in upper right of the code block), this only prints out the last Error . Error: StringError(\"func1 error\") The next chapters of this tutorial show how chainerror adds more information and improves inspecting the sources of an error. You can also run the tutorial examples in the checked out chainerror git repo . $ cargo run -q --example tutorial1 use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { if let Err(_) = do_some_io() { Err(\"func2 error\")?; } Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(_) = func2() { Err(\"func1 error\")?; } Ok(())\n} fn main() -> Result<(), Box<Error>> { func1()\n}","breadcrumbs":"Simple String Errors","id":"3","title":"Simple String Errors"},"4":{"body":"With relatively small changes and the help of the cherr! macro of the chainerror crate the String errors are now chained together. Press the play button in the upper right corner and see the nice debug output. use chainerror::*; use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { if let Err(e) = do_some_io() { Err(cherr!(e, \"func2 error\"))?; } Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(e) = func2() { Err(cherr!(e, \"func1 error\"))?; } Ok(())\n} fn main() -> Result<(), Box<Error>> { func1()\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Simple Chained String Errors","id":"4","title":"Simple Chained String Errors"},"5":{"body":"if let Err(e) = do_some_io() { Err(cherr!(e, \"func2 error\"))?; } The macro cherr!(olderror, newerror) stores olderror as the source/cause of newerror along with the filename ( file!() ) and line number ( line!() ) and returns newerror . Err()? then returns the inner error applying .into() , so that we again have a Err(Box<Error>) as a result. The Debug implementation of ChainError<T> (which is returned by cherr!() ) prints the Debug of T prefixed with the stored filename and line number. ChainError<T> in our case is ChainError<String> .","breadcrumbs":"What did we do here?","id":"5","title":"What did we do here?"},"6":{"body":"Now let's get more rust idiomatic by using .map_err() . use chainerror::*; use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { do_some_io().map_err(|e| cherr!(e, \"func2 error\"))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(|e| cherr!(e, \"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# } If you compare the output to the previous example, you will see, that: Error: src/main.rs:19: \"func1 error\" changed to just: src/main.rs:16: \"func1 error\" This is, because we caught the error of func1() in main() and print it out ourselves. We can now control, whether to output in Debug or Display mode. Maybe depending on --debug as a CLI argument.","breadcrumbs":"Mapping Errors","id":"6","title":"Mapping Errors"},"7":{"body":"Because decorating an error with more information should not let you jump through hoops, chainerror has a quick macro for that. mstrerror!() fits right into .map_err() letting you quickly add more debug strings. mstrerror!() even understands format!() syntax like println!() . use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Saving coding chars","id":"7","title":"Saving coding chars"},"8":{"body":"Sometimes you want to inspect the source() of an Error . chainerror implements std::error::Error::source() , so you can get the cause of an error. use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(e) = func2() { if let Some(s) = e.source() { eprintln!(\"func2 failed because of '{}'\", s); Err(e).map_err(mstrerr!(\"func1 error\"))?; } } Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# } Note, that because we changed the output of the error in main() from Debug to Display , we don't see the error backtrace with filename and line number. To enable the Display backtrace, you have to enable the feature display-cause for chainerror .","breadcrumbs":"The source() of Errors","id":"8","title":"The source() of Errors"},"9":{"body":"std::error::Error comes with some helper methods to get to the original object of the &(dyn Error + 'static) returned by .source() . pub fn downcast_ref<T: Error + 'static>(&self) -> Option<&T>\npub fn downcast_mut<T: Error + 'static>(&mut self) -> Option<&mut T> This is how it looks like, when using those: use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"Error: {}\", e); let mut s = e.as_ref(); while let Some(c) = s.source() { if let Some(ioerror) = c.downcast_ref::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } else { eprintln!(\"caused by: {}\", c); } s = c; } } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), 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It encapsulates all types, which have Display + Debug and can store the error cause internally. Along with the ChainError<T> struct, chainerror comes with some useful helper macros to save a lot of typing. Debug information is worth it! Now continue reading the Tutorial","breadcrumbs":"chainerror","id":"0","title":"chainerror"},"1":{"body":"Output: $ cargo run -q --example example\nMain Error Report: func1 error calling func2 Error reported by Func2Error: func2 error: calling func3 The root cause was: std::io::Error: Kind( NotFound\n) Debug Error:\nexamples/example.rs:45: func1 error calling func2\nCaused by:\nexamples/example.rs:20: Func2Error(func2 error: calling func3)\nCaused by:\nexamples/example.rs:13: Error reading 'foo.txt'\nCaused by:\nKind(NotFound) use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func3() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> ChainResult<(), Func2Error> { func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?; Ok(())\n} enum Func1Error { Func2, IO(String),\n} impl ::std::fmt::Display for Func1Error { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1Error::Func2 => write!(f, \"func1 error calling func2\"), Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1Error { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} fn func1() -> ChainResult<(), Func1Error> { func2().map_err(|e| cherr!(e, Func1Error::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?; Ok(())\n} fn main() { if let Err(e) = func1() { match e.kind() { Func1Error::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1Error::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } if let Some(e) = e.root_cause() { let ioerror = e.downcast_ref::<io::Error>().unwrap(); eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror); } eprintln!(\"\\nDebug Error:\\n{:?}\", e); }\n}","breadcrumbs":"Example:","id":"1","title":"Example:"},"10":{"body":"chainerror also has some helper methods: fn is_chain<T: 'static + Display + Debug>(&self) -> bool\nfn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>\nfn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>\nfn root_cause(&self) -> Option<&(dyn Error + 'static)>\nfn find_cause<U: Error + 'static>(&self) -> Option<&U>\nfn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>>\nfn kind<'a>(&'a self) -> &'a T Using downcast_chain_ref::<String>() gives a ChainError<String> , which can be used to call .find_cause::<io::Error>() . if let Some(s) = e.downcast_chain_ref::<String>() { if let Some(ioerror) = s.find_cause::<io::Error>() { or to use .root_cause() , which of course can be of any type implementing std::error::Error . if let Some(e) = s.root_cause() { use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"Error: {}\", e); if let Some(s) = e.downcast_chain_ref::<String>() { if let Some(ioerror) = s.find_cause::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } if let Some(e) = s.root_cause() { let ioerror = e.downcast_ref::<io::Error>().unwrap(); eprintln!(\"The root cause was: std::io::Error: {:#?}\", ioerror); } } } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"The root cause of all Errors","id":"10","title":"The root cause of all Errors"},"11":{"body":"To distinguish the errors occuring in various places, we can define named string errors with the \"new type\" pattern. derive_str_cherr!(Func2Error);\nderive_str_cherr!(Func1Error); Instead of ChainError<String> we now have struct Func1Error(String) and ChainError<Func1Error> . In the main function you can see, how we can match the different errors. Also see: if let Some(f2err) = f1err.find_chain_cause::<Func2Error>() { as a shortcut to if let Some(f2err) = f1err.find_cause::<ChainError<Func2Error>>() { hiding the ChainError<T> implementation detail. use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func1Error); fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() { eprintln!(\"Func1Error: {}\", f1err); if let Some(f2err) = f1err.find_cause::<ChainError<Func2Error>>() { eprintln!(\"Func2Error: {}\", f2err); } if let Some(f2err) = f1err.find_chain_cause::<Func2Error>() { eprintln!(\"Debug Func2Error:\\n{:?}\", f2err); } } } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Finding an Error cause","id":"11","title":"Finding an Error cause"},"12":{"body":"What about functions returning different Error types? In this example func1() can return either Func1ErrorFunc2 or Func1ErrorIO . We might want to match on func1() with something like: fn main() -> Result<(), Box<Error>> { match func1() { Err(e) if let Some(s) = e.downcast_chain_ref::<Func1ErrorIO>() => eprintln!(\"Func1ErrorIO:\\n{:?}\", s), Err(e) if let Some(s) = e.downcast_chain_ref::<Func1ErrorFunc2>() => eprintln!(\"Func1ErrorFunc2:\\n{:?}\", s), Ok(_) => {}, } Ok(())\n} but this is not valid rust code, so we end up doing it the hard way. In the next chapter, we will see, how to solve this more elegantly. use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func1ErrorFunc2);\nderive_str_cherr!(Func1ErrorIO); fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(Func1ErrorFunc2, \"func1 error calling func2\"))?; let filename = \"bar.txt\"; do_some_io().map_err(mstrerr!(Func1ErrorIO, \"Error reading '{}'\", filename))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { if let Some(s) = e.downcast_ref::<ChainError<Func1ErrorIO>>() { eprintln!(\"Func1ErrorIO:\\n{:?}\", s); } if let Some(s) = e.downcast_chain_ref::<Func1ErrorFunc2>() { eprintln!(\"Func1ErrorFunc2:\\n{:?}\", s); } } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Selective Error Handling","id":"12","title":"Selective Error Handling"},"13":{"body":"To cope with different kind of errors, we introduce the kind of an error Func1ErrorKind with an enum. Because we derive Debug and implement Display our Func1ErrorKind enum, this enum can be used as a std::error::Error . Not using String errors anymore, the cherr!() macro seen in the beginning of the tutorial has to be used again. Only returning Func1ErrorKind in func1() now let us get rid of Result<(), Box<Error>> and we can use ChainResult<(), Func1ErrorKind> . In main we can now directly use the methods of ChainError<T> without downcasting the error first. Also a nice match on ChainError<T>.kind() is now possible, which returns &T , meaning &Func1ErrorKind here. use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} #[derive(Debug)]\nenum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n}\nimpl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match e.kind() { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"ErrorKind to the rescue","id":"13","title":"ErrorKind to the rescue"},"14":{"body":"One small improvement at the end of the tutorial is to fix the debug output of Func1ErrorKind . As you probably noticed, the output doesn't say much of the enum. Debug Error:\nsrc/main.rs:35: Func2\n[…] As a lazy shortcut, we implement Debug by calling Display and end up with Debug Error:\nsrc/main.rs:40: func1 error calling func2\n[…} which gives us a lot more detail. To create your own Errors, you might find crates which create enum Display+Debug via derive macros. Also noteworthy is custom_error to define your custom errors, which can then be used with chainerror . use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} enum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} impl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match e.kind() { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Debug for the ErrorKind","id":"14","title":"Debug for the ErrorKind"},"15":{"body":"Because ChainError implements Deref to &T, we can also match on *e instead of e.kind() or call a function with &e use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} enum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} impl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn handle_func1errorkind(e: &Func1ErrorKind) { match e { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } }\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match *e { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } handle_func1errorkind(&e); if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Deref for the ErrorKind","id":"15","title":"Deref for the ErrorKind"},"16":{"body":"That's it for now… Happy error handling! To report issues, submit pull request or for the source code, examples and the book source, visit the Git Repo .","breadcrumbs":"The End","id":"16","title":"The End"},"2":{"body":"no-fileline : completely turn off storing filename and line display-cause : turn on printing a backtrace of the errors in Display no-debug-cause : turn off printing a backtrace of the errors in Debug","breadcrumbs":"Features","id":"2","title":"Features"},"3":{"body":"An easy way of doing error handling in rust is by returning String as a Box<std::error::Error> . If the rust main function returns an Err() , this Err() will be displayed with std::fmt::Debug . As you can see by running the example (by pressing the \"Play\" button in upper right of the code block), this only prints out the last Error . Error: StringError(\"func1 error\") The next chapters of this tutorial show how chainerror adds more information and improves inspecting the sources of an error. You can also run the tutorial examples in the checked out chainerror git repo . $ cargo run -q --example tutorial1 use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { if let Err(_) = do_some_io() { Err(\"func2 error\")?; } Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(_) = func2() { Err(\"func1 error\")?; } Ok(())\n} fn main() -> Result<(), Box<Error>> { func1()\n}","breadcrumbs":"Simple String Errors","id":"3","title":"Simple String Errors"},"4":{"body":"With relatively small changes and the help of the cherr! macro of the chainerror crate the String errors are now chained together. Press the play button in the upper right corner and see the nice debug output. use crate::chainerror::*; use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { if let Err(e) = do_some_io() { Err(cherr!(e, \"func2 error\"))?; } Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(e) = func2() { Err(cherr!(e, \"func1 error\"))?; } Ok(())\n} fn main() -> Result<(), Box<Error>> { func1()\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Simple Chained String Errors","id":"4","title":"Simple Chained String Errors"},"5":{"body":"if let Err(e) = do_some_io() { Err(cherr!(e, \"func2 error\"))?; } The macro cherr!(olderror, newerror) stores olderror as the source/cause of newerror along with the filename ( file!() ) and line number ( line!() ) and returns newerror . Err()? then returns the inner error applying .into() , so that we again have a Err(Box<Error>) as a result. The Debug implementation of ChainError<T> (which is returned by cherr!() ) prints the Debug of T prefixed with the stored filename and line number. ChainError<T> in our case is ChainError<String> .","breadcrumbs":"What did we do here?","id":"5","title":"What did we do here?"},"6":{"body":"Now let's get more rust idiomatic by using .map_err() . use crate::chainerror::*; use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { do_some_io().map_err(|e| cherr!(e, \"func2 error\"))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(|e| cherr!(e, \"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# } If you compare the output to the previous example, you will see, that: Error: src/main.rs:19: \"func1 error\" changed to just: src/main.rs:16: \"func1 error\" This is, because we caught the error of func1() in main() and print it out ourselves. We can now control, whether to output in Debug or Display mode. Maybe depending on --debug as a CLI argument.","breadcrumbs":"Mapping Errors","id":"6","title":"Mapping Errors"},"7":{"body":"Because decorating an error with more information should not let you jump through hoops, chainerror has a quick macro for that. mstrerror!() fits right into .map_err() letting you quickly add more debug strings. mstrerror!() even understands format!() syntax like println!() . use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{:?}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Saving coding chars","id":"7","title":"Saving coding chars"},"8":{"body":"Sometimes you want to inspect the source() of an Error . chainerror implements std::error::Error::source() , so you can get the cause of an error. use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(e) = func2() { if let Some(s) = e.source() { eprintln!(\"func2 failed because of '{}'\", s); Err(e).map_err(mstrerr!(\"func1 error\"))?; } } Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{}\", e); } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:ident, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# } Note, that because we changed the output of the error in main() from Debug to Display , we don't see the error backtrace with filename and line number. To enable the Display backtrace, you have to enable the feature display-cause for chainerror .","breadcrumbs":"The source() of Errors","id":"8","title":"The source() of Errors"},"9":{"body":"std::error::Error comes with some helper methods to get to the original object of the &(dyn Error + 'static) returned by .source() . pub fn downcast_ref<T: Error + 'static>(&self) -> Option<&T>\npub fn downcast_mut<T: Error + 'static>(&mut self) -> Option<&mut T> This is how it looks like, when using those: use crate::chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"Error: {}\", e); let mut s = e.as_ref(); while let Some(c) = s.source() { if let Some(ioerror) = c.downcast_ref::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } else { eprintln!(\"caused by: {}\", c); } s = c; } } Ok(())\n}\n# #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:ident, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:ident, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// 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=> ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:ident, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> 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It encapsulates all types, which have Display + Debug and can store the error cause internally. Along with the ChainError<T> struct, chainerror comes with some useful helper macros to save a lot of typing. Debug information is worth it! Now continue reading the Tutorial","breadcrumbs":"chainerror","id":"0","title":"chainerror"},"1":{"body":"Output: $ cargo run -q --example example\nMain Error Report: func1 error calling func2 Error reported by Func2Error: func2 error: calling func3 The root cause was: std::io::Error: Kind( NotFound\n) Debug Error:\nexamples/example.rs:45: func1 error calling func2\nCaused by:\nexamples/example.rs:20: Func2Error(func2 error: calling func3)\nCaused by:\nexamples/example.rs:13: Error reading 'foo.txt'\nCaused by:\nKind(NotFound) use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func3() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> ChainResult<(), Func2Error> { func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?; Ok(())\n} enum Func1Error { Func2, IO(String),\n} impl ::std::fmt::Display for Func1Error { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1Error::Func2 => write!(f, \"func1 error calling func2\"), Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1Error { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} fn func1() -> ChainResult<(), Func1Error> { func2().map_err(|e| cherr!(e, Func1Error::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?; Ok(())\n} fn main() { if let Err(e) = func1() { match e.kind() { Func1Error::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1Error::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } if let Some(e) = e.root_cause() { let ioerror = e.downcast_ref::<io::Error>().unwrap(); eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror); } eprintln!(\"\\nDebug Error:\\n{:?}\", e); }\n}","breadcrumbs":"Example:","id":"1","title":"Example:"},"10":{"body":"chainerror also has some helper methods: fn is_chain<T: 'static + Display + Debug>(&self) -> bool\nfn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>\nfn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>\nfn root_cause(&self) -> Option<&(dyn Error + 'static)>\nfn find_cause<U: Error + 'static>(&self) -> Option<&U>\nfn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>>\nfn kind<'a>(&'a self) -> &'a T Using downcast_chain_ref::<String>() gives a ChainError<String> , which can be used to call .find_cause::<io::Error>() . if let Some(s) = e.downcast_chain_ref::<String>() { if let Some(ioerror) = s.find_cause::<io::Error>() { or to use .root_cause() , which of course can be of any type implementing std::error::Error . if let Some(e) = s.root_cause() { use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"Error: {}\", e); if let Some(s) = e.downcast_chain_ref::<String>() { if let Some(ioerror) = s.find_cause::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } if let Some(e) = s.root_cause() { let ioerror = e.downcast_ref::<io::Error>().unwrap(); eprintln!(\"The root cause was: std::io::Error: {:#?}\", ioerror); } } } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"The root cause of all Errors","id":"10","title":"The root cause of all Errors"},"11":{"body":"To distinguish the errors occuring in various places, we can define named string errors with the \"new type\" pattern. derive_str_cherr!(Func2Error);\nderive_str_cherr!(Func1Error); Instead of ChainError<String> we now have struct Func1Error(String) and ChainError<Func1Error> . In the main function you can see, how we can match the different errors. Also see: if let Some(f2err) = f1err.find_chain_cause::<Func2Error>() { as a shortcut to if let Some(f2err) = f1err.find_cause::<ChainError<Func2Error>>() { hiding the ChainError<T> implementation detail. use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func1Error); fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() { eprintln!(\"Func1Error: {}\", f1err); if let Some(f2err) = f1err.find_cause::<ChainError<Func2Error>>() { eprintln!(\"Func2Error: {}\", f2err); } if let Some(f2err) = f1err.find_chain_cause::<Func2Error>() { eprintln!(\"Debug Func2Error:\\n{:?}\", f2err); } } } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Finding an Error cause","id":"11","title":"Finding an Error cause"},"12":{"body":"What about functions returning different Error types? In this example func1() can return either Func1ErrorFunc2 or Func1ErrorIO . We might want to match on func1() with something like: fn main() -> Result<(), Box<Error>> { match func1() { Err(e) if let Some(s) = e.downcast_chain_ref::<Func1ErrorIO>() => eprintln!(\"Func1ErrorIO:\\n{:?}\", s), Err(e) if let Some(s) = e.downcast_chain_ref::<Func1ErrorFunc2>() => eprintln!(\"Func1ErrorFunc2:\\n{:?}\", s), Ok(_) => {}, } Ok(())\n} but this is not valid rust code, so we end up doing it the hard way. In the next chapter, we will see, how to solve this more elegantly. use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} derive_str_cherr!(Func1ErrorFunc2);\nderive_str_cherr!(Func1ErrorIO); fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(Func1ErrorFunc2, \"func1 error calling func2\"))?; let filename = \"bar.txt\"; do_some_io().map_err(mstrerr!(Func1ErrorIO, \"Error reading '{}'\", filename))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { if let Some(s) = e.downcast_ref::<ChainError<Func1ErrorIO>>() { eprintln!(\"Func1ErrorIO:\\n{:?}\", s); } if let Some(s) = e.downcast_chain_ref::<Func1ErrorFunc2>() { eprintln!(\"Func1ErrorFunc2:\\n{:?}\", s); } } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Selective Error Handling","id":"12","title":"Selective Error Handling"},"13":{"body":"To cope with different kind of errors, we introduce the kind of an error Func1ErrorKind with an enum. Because we derive Debug and implement Display our Func1ErrorKind enum, this enum can be used as a std::error::Error . Not using String errors anymore, the cherr!() macro seen in the beginning of the tutorial has to be used again. Only returning Func1ErrorKind in func1() now let us get rid of Result<(), Box<Error>> and we can use ChainResult<(), Func1ErrorKind> . In main we can now directly use the methods of ChainError<T> without downcasting the error first. Also a nice match on ChainError<T>.kind() is now possible, which returns &T , meaning &Func1ErrorKind here. use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} #[derive(Debug)]\nenum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n}\nimpl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match e.kind() { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"ErrorKind to the rescue","id":"13","title":"ErrorKind to the rescue"},"14":{"body":"One small improvement at the end of the tutorial is to fix the debug output of Func1ErrorKind . As you probably noticed, the output doesn't say much of the enum. Debug Error:\nsrc/main.rs:35: Func2\n[…] As a lazy shortcut, we implement Debug by calling Display and end up with Debug Error:\nsrc/main.rs:40: func1 error calling func2\n[…} which gives us a lot more detail. To create your own Errors, you might find crates which create enum Display+Debug via derive macros. Also noteworthy is custom_error to define your custom errors, which can then be used with chainerror . use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} enum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} impl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match e.kind() { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Debug for the ErrorKind","id":"14","title":"Debug for the ErrorKind"},"15":{"body":"Because ChainError implements Deref to &T, we can also match on *e instead of e.kind() or call a function with &e use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} derive_str_cherr!(Func2Error); fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(())\n} enum Func1ErrorKind { Func2, IO(String),\n} impl ::std::fmt::Display for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } }\n} impl ::std::fmt::Debug for Func1ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { write!(f, \"{}\", self) }\n} impl ::std::error::Error for Func1ErrorKind {} fn func1() -> ChainResult<(), Func1ErrorKind> { func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(filename)))?; Ok(())\n} fn handle_func1errorkind(e: &Func1ErrorKind) { match e { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } }\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { match *e { Func1ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), Func1ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } handle_func1errorkind(&e); if let Some(e) = e.find_chain_cause::<Func2Error>() { eprintln!(\"\\nError reported by Func2Error: {}\", e) } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Deref for the ErrorKind","id":"15","title":"Deref for the ErrorKind"},"16":{"body":"I would advise to only expose an mycrate::ErrorKind and type alias mycrate::Error to ChainError<mycrate::ErrorKind> so you can tell your library users to use the .kind() method as std::io::Error does. If you later decide to make your own Error implementation, your library users don't have to change much or anything. # #[allow(dead_code)]\n# #[macro_use]\n# pub mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }\npub mod mycrate { use crate::chainerror::*; // omit the `crate::` part use std::io; fn do_some_io() -> std::result::Result<(), Box<std::error::Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(()) } derive_str_cherr!(Func2Error); fn func2() -> std::result::Result<(), Box<std::error::Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?; Ok(()) } #[derive(Debug)] pub enum ErrorKind { Func2, IO(String), } pub type Error = ChainError<ErrorKind>; pub type Result<T> = std::result::Result<T, Error>; impl ::std::fmt::Display for ErrorKind { fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result { match self { ErrorKind::Func2 => write!(f, \"func1 error calling func2\"), ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename), } } } pub fn func1() -> Result<()> { func2().map_err(|e| cherr!(e, ErrorKind::Func2))?; let filename = String::from(\"bar.txt\"); do_some_io().map_err(|e| cherr!(e, ErrorKind::IO(filename)))?; Ok(()) }\n} fn main() -> Result<(), Box<std::error::Error>> { use mycrate::func1; use mycrate::ErrorKind; use std::error::Error; use std::io; if let Err(e) = func1() { match e.kind() { ErrorKind::Func2 => eprintln!(\"Main Error Report: func1 error calling func2\"), ErrorKind::IO(ref filename) => { eprintln!(\"Main Error Report: func1 error reading '{}'\", filename) } } eprintln!(); let mut s : &Error = &e; while let Some(c) = s.source() { if let Some(ioerror) = c.downcast_ref::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } else { eprintln!(\"caused by: {}\", c); } s = c; } eprintln!(\"\\nDebug Error:\\n{:?}\", e); } Ok(())\n}","breadcrumbs":"Writing a library","id":"16","title":"Writing a library"},"17":{"body":"That's it for now… Happy error handling! To report issues, submit pull request or for the source code, examples and the book source, visit the Git Repo .","breadcrumbs":"The End","id":"17","title":"The End"},"2":{"body":"no-fileline : completely turn off storing filename and line display-cause : turn on printing a backtrace of the errors in Display no-debug-cause : turn off printing a backtrace of the errors in Debug","breadcrumbs":"Features","id":"2","title":"Features"},"3":{"body":"An easy way of doing error handling in rust is by returning String as a Box<std::error::Error> . If the rust main function returns an Err() , this Err() will be displayed with std::fmt::Debug . As you can see by running the example (by pressing the \"Play\" button in upper right of the code block), this only prints out the last Error . Error: StringError(\"func1 error\") The next chapters of this tutorial show how chainerror adds more information and improves inspecting the sources of an error. You can also run the tutorial examples in the checked out chainerror git repo . $ cargo run -q --example tutorial1 use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { if let Err(_) = do_some_io() { Err(\"func2 error\")?; } Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(_) = func2() { Err(\"func1 error\")?; } Ok(())\n} fn main() -> Result<(), Box<Error>> { func1()\n}","breadcrumbs":"Simple String Errors","id":"3","title":"Simple String Errors"},"4":{"body":"With relatively small changes and the help of the cherr! macro of the chainerror crate the String errors are now chained together. Press the play button in the upper right corner and see the nice debug output. use chainerror::*; use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { if let Err(e) = do_some_io() { Err(cherr!(e, \"func2 error\"))?; } Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(e) = func2() { Err(cherr!(e, \"func1 error\"))?; } Ok(())\n} fn main() -> Result<(), Box<Error>> { func1()\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Simple Chained String Errors","id":"4","title":"Simple Chained String Errors"},"5":{"body":"if let Err(e) = do_some_io() { Err(cherr!(e, \"func2 error\"))?; } The macro cherr!(olderror, newerror) stores olderror as the source/cause of newerror along with the filename ( file!() ) and line number ( line!() ) and returns newerror . Err()? then returns the inner error applying .into() , so that we again have a Err(Box<Error>) as a result. The Debug implementation of ChainError<T> (which is returned by cherr!() ) prints the Debug of T prefixed with the stored filename and line number. ChainError<T> in our case is ChainError<String> .","breadcrumbs":"What did we do here?","id":"5","title":"What did we do here?"},"6":{"body":"Now let's get more rust idiomatic by using .map_err() . use chainerror::*; use std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { do_some_io().map_err(|e| cherr!(e, \"func2 error\"))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(|e| cherr!(e, \"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# } If you compare the output to the previous example, you will see, that: Error: src/main.rs:19: \"func1 error\" changed to just: src/main.rs:16: \"func1 error\" This is, because we caught the error of func1() in main() and print it out ourselves. We can now control, whether to output in Debug or Display mode. Maybe depending on --debug as a CLI argument.","breadcrumbs":"Mapping Errors","id":"6","title":"Mapping Errors"},"7":{"body":"Because decorating an error with more information should not let you jump through hoops, chainerror has a quick macro for that. mstrerror!() fits right into .map_err() letting you quickly add more debug strings. mstrerror!() even understands format!() syntax like println!() . use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{:?}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# }","breadcrumbs":"Saving coding chars","id":"7","title":"Saving coding chars"},"8":{"body":"Sometimes you want to inspect the source() of an Error . chainerror implements std::error::Error::source() , so you can get the cause of an error. use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { if let Err(e) = func2() { if let Some(s) = e.source() { eprintln!(\"func2 failed because of '{}'\", s); Err(e).map_err(mstrerr!(\"func1 error\"))?; } } Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"{}\", e); } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( None, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!(None, format!($fmt, $($arg)+ ))\n# });\n# ( $e:path, $k:expr ) => ({\n# ChainError::<_>::new($k, Some(Box::from($e)), Some((line!(), file!())))\n# });\n# ( $e:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($e, format!($fmt, $($arg)+ ))\n# });\n# # }\n# # /// Convenience macro for `|e| cherr!(e, format!(…))`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(\"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # #[cfg(not(windows))]\n# /// # assert_eq!(\n# /// # format!(\"\\n{:?}\\n\", e), r#\"\n# /// # src/lib.rs:20: func1 error\n# /// # Caused by:\n# /// # src/lib.rs:15: Error reading 'foo.txt'\n# /// # Caused by:\n# /// # Kind(NotFound)\n# /// # \"#\n# /// # );\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// `mstrerr!()` can also be used to map a new `ChainError<T>`, where T was defined with\n# /// `derive_str_cherr!(T)`\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! mstrerr {\n# ( $t:path, $msg:expr ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# |e| cherr!(e, $t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# |e| cherr!(e, $t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# |e| cherr!(e, $msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# |e| cherr!(e, format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::result::Result;\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// Err(strerr!(Func2Error, \"Error reading '{}'\", filename))\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! strerr {\n# ( $t:path, $msg:expr ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $msg:expr, ) => ({\n# cherr!($t ($msg.to_string()))\n# });\n# ( $t:path, $fmt:expr, $($arg:tt)+ ) => ({\n# cherr!($t (format!($fmt, $($arg)+ )))\n# });\n# ($msg:expr) => ({\n# cherr!($msg.to_string())\n# });\n# ($msg:expr, ) => ({\n# cherr!($msg.to_string())\n# });\n# ($fmt:expr, $($arg:tt)+) => ({\n# cherr!(format!($fmt, $($arg)+ ))\n# });\n# }\n# # /// Convenience macro to create a \"new type\" T(String) and implement Display + Debug for T\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// # fn do_some_io() -> Result<(), Box<Error>> {\n# /// # Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// # Ok(())\n# /// # }\n# /// #\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> ChainResult<(), Func2Error> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # fn main() {\n# /// # if let Err(e) = func1() {\n# /// # if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# /// # assert!(f1err.find_cause::<ChainError<Func2Error>>().is_some());\n# /// # assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// # } else {\n# /// # panic!();\n# /// # }\n# /// # } else {\n# /// # unreachable!();\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! derive_str_cherr {\n# ($e:ident) => {\n# pub struct $e(pub String);\n# impl ::std::fmt::Display for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}\", self.0)\n# }\n# }\n# impl ::std::fmt::Debug for $e {\n# fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# write!(f, \"{}({})\", stringify!($e), self.0)\n# }\n# }\n# impl ::std::error::Error for $e {}\n# };\n# }\n# } Note, that because we changed the output of the error in main() from Debug to Display , we don't see the error backtrace with filename and line number. To enable the Display backtrace, you have to enable the feature display-cause for chainerror .","breadcrumbs":"The source() of Errors","id":"8","title":"The source() of Errors"},"9":{"body":"std::error::Error comes with some helper methods to get to the original object of the &(dyn Error + 'static) returned by .source() . pub fn downcast_ref<T: Error + 'static>(&self) -> Option<&T>\npub fn downcast_mut<T: Error + 'static>(&mut self) -> Option<&mut T> This is how it looks like, when using those: use chainerror::*;\nuse std::error::Error;\nuse std::io;\nuse std::result::Result; fn do_some_io() -> Result<(), Box<Error>> { Err(io::Error::from(io::ErrorKind::NotFound))?; Ok(())\n} fn func2() -> Result<(), Box<Error>> { let filename = \"foo.txt\"; do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?; Ok(())\n} fn func1() -> Result<(), Box<Error>> { func2().map_err(mstrerr!(\"func1 error\"))?; Ok(())\n} fn main() -> Result<(), Box<Error>> { if let Err(e) = func1() { eprintln!(\"Error: {}\", e); let mut s = e.as_ref(); while let Some(c) = s.source() { if let Some(ioerror) = c.downcast_ref::<io::Error>() { eprintln!(\"caused by: std::io::Error: {}\", ioerror); match ioerror.kind() { io::ErrorKind::NotFound => eprintln!(\"of kind: std::io::ErrorKind::NotFound\"), _ => {} } } else { eprintln!(\"caused by: {}\", c); } s = c; } } Ok(())\n} # #[allow(dead_code)]\n# mod chainerror {\n# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your\n# //! binaries, you still have the error backtrace.\n# //!\n# //! `chainerror` has no dependencies!\n# //!\n# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.\n# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.\n# //!\n# //! Along with the `ChainError<T>` struct, `chainerror` comes with some useful helper macros to save a lot of typing.\n# //!\n# //! ## Features\n# //!\n# //! `no-fileline`\n# //! : completely turn off storing filename and line\n# //!\n# //! `display-cause`\n# //! : turn on printing a backtrace of the errors in `Display`\n# //!\n# //! `no-debug-cause`\n# //! : turn off printing a backtrace of the errors in `Debug`\n# //!\n# //!\n# //! # Tutorial\n# //!\n# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)\n# //!\n# //! # Examples\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func2() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func1() -> Result<(), Box<Error>> {\n# //! func2().map_err(mstrerr!(\"func1 error\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:20: func1 error\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# //!\n# //!\n# //! ~~~rust\n# //! use chainerror::*;\n# //! use std::error::Error;\n# //! use std::io;\n# //! use std::result::Result;\n# //!\n# //! fn do_some_io() -> Result<(), Box<Error>> {\n# //! Err(io::Error::from(io::ErrorKind::NotFound))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn func3() -> Result<(), Box<Error>> {\n# //! let filename = \"foo.txt\";\n# //! do_some_io().map_err(mstrerr!(\"Error reading '{}'\", filename))?;\n# //! Ok(())\n# //! }\n# //!\n# //! derive_str_cherr!(Func2Error);\n# //!\n# //! fn func2() -> ChainResult<(), Func2Error> {\n# //! func3().map_err(mstrerr!(Func2Error, \"func2 error: calling func3\"))?;\n# //! Ok(())\n# //! }\n# //!\n# //! enum Func1Error {\n# //! Func2,\n# //! IO(String),\n# //! }\n# //!\n# //! impl ::std::fmt::Display for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! match self {\n# //! Func1Error::Func2 => write!(f, \"func1 error calling func2\"),\n# //! Func1Error::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# //! }\n# //! }\n# //! }\n# //!\n# //! impl ::std::fmt::Debug for Func1Error {\n# //! fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# //! write!(f, \"{}\", self)\n# //! }\n# //! }\n# //!\n# //! fn func1() -> ChainResult<(), Func1Error> {\n# //! func2().map_err(|e| cherr!(e, Func1Error::Func2))?;\n# //! let filename = String::from(\"bar.txt\");\n# //! do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;\n# //! Ok(())\n# //! }\n# //!\n# //! fn main() {\n# //! if let Err(e) = func1() {\n# //! assert!(\n# //! match e.kind() {\n# //! Func1Error::Func2 => {\n# //! eprintln!(\"Main Error Report: func1 error calling func2\");\n# //! true\n# //! }\n# //! Func1Error::IO(filename) => {\n# //! eprintln!(\"Main Error Report: func1 error reading '{}'\", filename);\n# //! false\n# //! }\n# //! }\n# //! );\n# //!\n# //! assert!(e.find_chain_cause::<Func2Error>().is_some());\n# //!\n# //! if let Some(e) = e.find_chain_cause::<Func2Error>() {\n# //! eprintln!(\"\\nError reported by Func2Error: {}\", e)\n# //! }\n# //!\n# //!\n# //! assert!(e.root_cause().is_some());\n# //!\n# //! if let Some(e) = e.root_cause() {\n# //! let ioerror = e.downcast_ref::<io::Error>().unwrap();\n# //! eprintln!(\"\\nThe root cause was: std::io::Error: {:#?}\", ioerror);\n# //! }\n# //!\n# //! #[cfg(not(windows))]\n# //! assert_eq!(\n# //! format!(\"\\n{:?}\\n\", e), r#\"\n# //! src/lib.rs:47: func1 error calling func2\n# //! Caused by:\n# //! src/lib.rs:22: Func2Error(func2 error: calling func3)\n# //! Caused by:\n# //! src/lib.rs:15: Error reading 'foo.txt'\n# //! Caused by:\n# //! Kind(NotFound)\n# //! \"#\n# //! );\n# //! }\n# //! # else {\n# //! # unreachable!();\n# //! # }\n# //! }\n# //! ~~~\n# # use std::any::TypeId;\n# use std::error::Error;\n# use std::fmt::{Debug, Display, Formatter, Result};\n# # /// chains an inner error kind `T` with a causing error\n# pub struct ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# occurrence: Option<(u32, &'static str)>,\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# }\n# # /// convenience type alias\n# pub type ChainResult<O, E> = std::result::Result<O, ChainError<E>>;\n# # impl<T: 'static + Display + Debug> ChainError<T> {\n# #[cfg(not(feature = \"no-fileline\"))]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self {\n# occurrence,\n# kind,\n# error_cause,\n# }\n# }\n# # #[cfg(feature = \"no-fileline\")]\n# /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly\n# pub fn new(\n# kind: T,\n# error_cause: Option<Box<dyn Error + 'static>>,\n# _occurrence: Option<(u32, &'static str)>,\n# ) -> Self {\n# Self { kind, error_cause }\n# }\n# # /// return the root cause of the error chain, if any exists\n# pub fn root_cause(&self) -> Option<&(dyn Error + 'static)> {\n# self.iter().last()\n# }\n# # /// Find the first error cause of type U, if any exists\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func1Error);\n# ///\n# /// fn func1() -> Result<(), Box<Error>> {\n# /// func2().map_err(mstrerr!(Func1Error, \"func1 error\"))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// if let Some(f1err) = e.downcast_chain_ref::<Func1Error>() {\n# ///\n# /// assert!(f1err.find_cause::<io::Error>().is_some());\n# ///\n# /// assert!(f1err.find_chain_cause::<Func2Error>().is_some());\n# /// }\n# /// # else {\n# /// # panic!();\n# /// # }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn find_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter().filter_map(Error::downcast_ref::<U>).next()\n# }\n# # /// Find the first error cause of type `ChainError<U>`, if any exists\n# ///\n# /// Same as `find_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooError>>();\n# ///\n# /// // leave out the ChainError<FooError> implementation detail\n# /// err.find_chain_cause::<FooError>();\n# /// ~~~\n# pub fn find_chain_cause<U: Error + 'static>(&self) -> Option<&ChainError<U>> {\n# self.iter()\n# .filter_map(Error::downcast_ref::<ChainError<U>>)\n# .next()\n# }\n# # /// Find the first error cause of type `ChainError<U>` or `U`, if any exists and return `U`\n# ///\n# /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError<U>` implementation internals\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust,ignore\n# /// // Instead of writing\n# /// err.find_cause::<ChainError<FooErrorKind>>();\n# /// // and/or\n# /// err.find_chain_cause::<FooErrorKind>();\n# /// // and/or\n# /// err.find_cause::<FooErrorKind>();\n# ///\n# /// // leave out the ChainError<FooErrorKind> implementation detail\n# /// err.find_chain_or_kind::<FooErrorKind>();\n# /// ~~~\n# pub fn find_kind_or_cause<U: Error + 'static>(&self) -> Option<&U> {\n# self.iter()\n# .filter_map(|e| {\n# e.downcast_ref::<ChainError<U>>()\n# .map(|e| e.kind())\n# .or_else(|| e.downcast_ref::<U>())\n# })\n# .next()\n# }\n# # /// Return a reference to T of `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// ~~~rust\n# /// # use crate::chainerror::*;\n# /// # use std::error::Error;\n# /// # use std::io;\n# /// # use std::result::Result;\n# /// #\n# /// fn do_some_io() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// derive_str_cherr!(Func2Error);\n# ///\n# /// fn func2() -> Result<(), Box<Error>> {\n# /// let filename = \"foo.txt\";\n# /// do_some_io().map_err(mstrerr!(Func2Error, \"Error reading '{}'\", filename))?;\n# /// Ok(())\n# /// }\n# ///\n# /// #[derive(Debug)]\n# /// enum Func1ErrorKind {\n# /// Func2,\n# /// IO(String),\n# /// }\n# ///\n# /// /// impl ::std::fmt::Display for Func1ErrorKind {…}\n# /// # impl ::std::fmt::Display for Func1ErrorKind {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # Func1ErrorKind::Func2 => write!(f, \"func1 error calling func2\"),\n# /// # Func1ErrorKind::IO(filename) => write!(f, \"Error reading '{}'\", filename),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// fn func1() -> ChainResult<(), Func1ErrorKind> {\n# /// func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;\n# /// do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(\"bar.txt\".into())))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn main() {\n# /// if let Err(e) = func1() {\n# /// match e.kind() {\n# /// Func1ErrorKind::Func2 => {},\n# /// Func1ErrorKind::IO(filename) => panic!(),\n# /// }\n# /// }\n# /// # else {\n# /// # unreachable!();\n# /// # }\n# /// }\n# /// ~~~\n# pub fn kind(&self) -> &T {\n# &self.kind\n# }\n# # /// Returns an Iterator over all error causes/sources\n# ///\n# /// # Example\n# ///\n# ///\n# pub fn iter(&self) -> impl Iterator<Item = &(dyn Error + 'static)> {\n# ErrorIter {\n# current: Some(self),\n# }\n# }\n# }\n# # struct ErrorIter<'a> {\n# current: Option<&'a (dyn Error + 'static)>,\n# }\n# # impl<'a> Iterator for ErrorIter<'a> {\n# type Item = &'a (dyn Error + 'static);\n# # fn next(&mut self) -> Option<Self::Item> {\n# let current = self.current;\n# self.current = self.current.and_then(Error::source);\n# current\n# }\n# }\n# # impl<T: 'static + Display + Debug> std::ops::Deref for ChainError<T> {\n# type Target = T;\n# # fn deref(&self) -> &Self::Target {\n# &self.kind\n# }\n# }\n# # /// Convenience trait to hide the `ChainError<T>` implementation internals\n# pub trait ChainErrorDown {\n# /// Test if of type `ChainError<T>`\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool;\n# /// Downcast to a reference of `ChainError<T>`\n# fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>>;\n# /// Downcast to a mutable reference of `ChainError<T>`\n# fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>>;\n# }\n# # impl<U: 'static + Display + Debug> ChainErrorDown for ChainError<U> {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# TypeId::of::<T>() == TypeId::of::<U>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&*(self as *const dyn Error as *const &ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# if self.is_chain::<T>() {\n# #[allow(clippy::cast_ptr_alignment)]\n# unsafe {\n# Some(&mut *(self as *mut dyn Error as *mut &mut ChainError<T>))\n# }\n# } else {\n# None\n# }\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl ChainErrorDown for dyn Error + 'static + Send + Sync {\n# fn is_chain<T: 'static + Display + Debug>(&self) -> bool {\n# self.is::<ChainError<T>>()\n# }\n# # fn downcast_chain_ref<T: 'static + Display + Debug>(&self) -> Option<&ChainError<T>> {\n# self.downcast_ref::<ChainError<T>>()\n# }\n# # fn downcast_chain_mut<T: 'static + Display + Debug>(&mut self) -> Option<&mut ChainError<T>> {\n# self.downcast_mut::<ChainError<T>>()\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Error for &mut ChainError<T> {\n# fn source(&self) -> Option<&(dyn Error + 'static)> {\n# self.error_cause.as_ref().map(|e| e.as_ref())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Display for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# write!(f, \"{}\", self.kind)?;\n# # #[cfg(feature = \"display-cause\")]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Display::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # impl<T: 'static + Display + Debug> Debug for ChainError<T> {\n# fn fmt(&self, f: &mut Formatter) -> Result {\n# #[cfg(not(feature = \"no-fileline\"))]\n# {\n# if let Some(o) = self.occurrence {\n# write!(f, \"{}:{}: \", o.1, o.0)?;\n# }\n# }\n# # if self.is_chain::<String>() {\n# Display::fmt(&self.kind, f)?;\n# } else {\n# Debug::fmt(&self.kind, f)?;\n# }\n# # #[cfg(not(feature = \"no-debug-cause\"))]\n# {\n# if let Some(e) = self.source() {\n# writeln!(f, \"\\nCaused by:\")?;\n# Debug::fmt(&e, f)?;\n# }\n# }\n# Ok(())\n# }\n# }\n# # pub trait ChainErrorFrom<T>: Sized {\n# fn chain_error_from(_: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self>;\n# }\n# # pub trait IntoChainError<T>: Sized {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<T>;\n# }\n# # impl<T, U> IntoChainError<U> for T\n# where\n# U: ChainErrorFrom<T>,\n# {\n# fn into_chain_error(self, line_filename: Option<(u32, &'static str)>) -> ChainError<U> {\n# U::chain_error_from(self, line_filename)\n# }\n# }\n# # impl<T, U> ChainErrorFrom<T> for U\n# where\n# T: Into<U>,\n# U: 'static + Display + Debug,\n# {\n# fn chain_error_from(t: T, line_filename: Option<(u32, &'static str)>) -> ChainError<Self> {\n# let e: U = t.into();\n# ChainError::<_>::new(e, None, line_filename)\n# }\n# }\n# # #[macro_export]\n# macro_rules! minto_cherr {\n# ( ) => {\n# |e| e.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # #[macro_export]\n# macro_rules! into_cherr {\n# ( $t:expr ) => {\n# $t.into_chain_error(Some((line!(), file!())))\n# };\n# }\n# # /// Creates a new `ChainError<T>`\n# ///\n# /// # Examples\n# ///\n# /// Create a new ChainError<FooError>, where `FooError` must implement `Display` and `Debug`.\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// #\n# /// # #[derive(Debug)]\n# /// enum FooError {\n# /// Bar,\n# /// Baz(&'static str),\n# /// }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# ///\n# /// // impl ::std::fmt::Display for FooError\n# ///\n# /// fn do_some_stuff() -> bool {\n# /// false\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// if ! do_some_stuff() {\n# /// Err(cherr!(FooError::Baz(\"Error\")))?;\n# /// }\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# ///\n# /// Additionally an error cause can be added.\n# ///\n# /// ~~~rust\n# /// # use chainerror::*;\n# /// # use std::io;\n# /// # use std::error::Error;\n# /// #\n# /// # #[derive(Debug)]\n# /// # enum FooError {\n# /// # Bar,\n# /// # Baz(&'static str),\n# /// # }\n# /// #\n# /// # impl ::std::fmt::Display for FooError {\n# /// # fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {\n# /// # match self {\n# /// # FooError::Bar => write!(f, \"Bar Error\"),\n# /// # FooError::Baz(s) => write!(f, \"Baz Error: '{}'\", s),\n# /// # }\n# /// # }\n# /// # }\n# /// #\n# /// fn do_some_stuff() -> Result<(), Box<Error>> {\n# /// Err(io::Error::from(io::ErrorKind::NotFound))?;\n# /// Ok(())\n# /// }\n# ///\n# /// fn func() -> ChainResult<(), FooError> {\n# /// do_some_stuff().map_err(\n# /// |e| cherr!(e, FooError::Baz(\"Error\"))\n# /// )?;\n# /// Ok(())\n# /// }\n# /// #\n# /// # pub fn main() {\n# /// # match func().unwrap_err().kind() {\n# /// # FooError::Baz(s) if s == &\"Error\" => {},\n# /// # _ => panic!(),\n# /// # }\n# /// # }\n# /// ~~~\n# #[macro_export]\n# macro_rules! cherr {\n# ( $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), file!())))\n# });\n# ( None, $k:expr ) => ({\n# ChainError::<_>::new($k, None, Some((line!(), 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-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html" class="active"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html" class="active"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
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-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html" class="active"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html" class="active"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -151,7 +151,7 @@ use <code>ChainResult&lt;(), Func1ErrorKind&gt;</code>.</p>
 <p>In <code>main</code> we can now directly use the methods of <code>ChainError&lt;T&gt;</code> without downcasting the error first.</p>
 <p>Also a nice <code>match</code> on <code>ChainError&lt;T&gt;.kind()</code> is now possible, which returns <code>&amp;T</code>, meaning
 <code>&amp;Func1ErrorKind</code> here.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -209,6 +209,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -897,15 +898,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -1000,21 +995,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1067,21 +1053,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial11.html b/tutorial11.html
index c346aa3..4713c46 100644
--- a/tutorial11.html
+++ b/tutorial11.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html" class="active"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html" class="active"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -156,7 +156,7 @@ src/main.rs:40: func1 error calling func2
 <p>To create your own Errors, you might find <a href="https://crates.io">crates</a> which create enum <code>Display+Debug</code> via derive macros.</p>
 <p>Also noteworthy is <a href="https://crates.io/crates/custom_error">custom_error</a> to define your custom errors,
 which can then be used with <code>chainerror</code>.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -220,6 +220,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -908,15 +909,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -1011,21 +1006,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1078,21 +1064,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial12.html b/tutorial12.html
index b7eec77..dac3303 100644
--- a/tutorial12.html
+++ b/tutorial12.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html" class="active"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html" class="active"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -143,7 +143,7 @@
                         <a class="header" href="#deref-for-the-errorkind" id="deref-for-the-errorkind"><h1>Deref for the ErrorKind</h1></a>
 <p>Because ChainError<T> implements Deref to &amp;T, we can also match on <code>*e</code> instead of <code>e.kind()</code>
 or call a function with <code>&amp;e</code></p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -218,6 +218,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -906,15 +907,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -1009,21 +1004,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1076,21 +1062,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
@@ -1179,7 +1156,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
                         
 
                         
-                            <a rel="next" href="end.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                            <a rel="next" href="tutorial13.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                                 <i class="fa fa-angle-right"></i>
                             </a>
                         
@@ -1197,7 +1174,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
                 
 
                 
-                    <a href="end.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
+                    <a href="tutorial13.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
                         <i class="fa fa-angle-right"></i>
                     </a>
                 
diff --git a/tutorial13.html b/tutorial13.html
new file mode 100644
index 0000000..9fb6750
--- /dev/null
+++ b/tutorial13.html
@@ -0,0 +1,1210 @@
+<!DOCTYPE HTML>
+<html lang="en" class="sidebar-visible no-js">
+    <head>
+        <!-- Book generated using mdBook -->
+        <meta charset="UTF-8">
+        <title>Writing a library - chainerror</title>
+        <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
+        <meta name="description" content="A tutorial for the chainerror rust crate.">
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="theme-color" content="#ffffff" />
+
+        <link rel="shortcut icon" href="favicon.png">
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+        <!-- Provide site root to javascript -->
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+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html" class="active"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
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+                    <main>
+                        <a class="header" href="#writing-a-library" id="writing-a-library"><h1>Writing a library</h1></a>
+<p>I would advise to only expose an <code>mycrate::ErrorKind</code> and type alias <code>mycrate::Error</code> to <code>ChainError&lt;mycrate::ErrorKind&gt;</code>
+so you can tell your library users to use the <code>.kind()</code> method as <code>std::io::Error</code> does.</p>
+<p>If you later decide to make your own <code>Error</code> implementation, your library users don't
+have to change much or anything.</p>
+<pre><pre class="playpen"><code class="language-rust"># #[allow(dead_code)]
+# #[macro_use]
+# pub mod chainerror {
+# //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
+# //! binaries, you still have the error backtrace.
+# //!
+# //! `chainerror` has no dependencies!
+# //!
+# //! `chainerror` uses `.source()` of `std::error::Error` along with `line()!` and `file()!` to provide a nice debug error backtrace.
+# //! It encapsulates all types, which have `Display + Debug` and can store the error cause internally.
+# //!
+# //! Along with the `ChainError&lt;T&gt;` struct, `chainerror` comes with some useful helper macros to save a lot of typing.
+# //!
+# //! ## Features
+# //!
+# //! `no-fileline`
+# //! : completely turn off storing filename and line
+# //!
+# //! `display-cause`
+# //! : turn on printing a backtrace of the errors in `Display`
+# //!
+# //! `no-debug-cause`
+# //! : turn off printing a backtrace of the errors in `Debug`
+# //!
+# //!
+# //! # Tutorial
+# //!
+# //! Read the [Tutorial](https://haraldh.github.io/chainerror/tutorial1.html)
+# //!
+# //! # Examples
+# //!
+# //! ~~~rust
+# //! use chainerror::*;
+# //! use std::error::Error;
+# //! use std::io;
+# //! use std::result::Result;
+# //!
+# //! fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     let filename = &quot;foo.txt&quot;;
+# //!     do_some_io().map_err(mstrerr!(&quot;Error reading '{}'&quot;, filename))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     func2().map_err(mstrerr!(&quot;func1 error&quot;))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn main() {
+# //!     if let Err(e) = func1() {
+# //!         #[cfg(not(windows))]
+# //!         assert_eq!(
+# //!             format!(&quot;\n{:?}\n&quot;, e), r#&quot;
+# //! src/lib.rs:20: func1 error
+# //! Caused by:
+# //! src/lib.rs:15: Error reading 'foo.txt'
+# //! Caused by:
+# //! Kind(NotFound)
+# //! &quot;#
+# //!         );
+# //!     }
+# //! #    else {
+# //! #        unreachable!();
+# //! #    }
+# //! }
+# //! ~~~
+# //!
+# //!
+# //! ~~~rust
+# //! use chainerror::*;
+# //! use std::error::Error;
+# //! use std::io;
+# //! use std::result::Result;
+# //!
+# //! fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn func3() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# //!     let filename = &quot;foo.txt&quot;;
+# //!     do_some_io().map_err(mstrerr!(&quot;Error reading '{}'&quot;, filename))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! derive_str_cherr!(Func2Error);
+# //!
+# //! fn func2() -&gt; ChainResult&lt;(), Func2Error&gt; {
+# //!     func3().map_err(mstrerr!(Func2Error, &quot;func2 error: calling func3&quot;))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! enum Func1Error {
+# //!     Func2,
+# //!     IO(String),
+# //! }
+# //!
+# //! impl ::std::fmt::Display for Func1Error {
+# //!     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+# //!         match self {
+# //!             Func1Error::Func2 =&gt; write!(f, &quot;func1 error calling func2&quot;),
+# //!             Func1Error::IO(filename) =&gt; write!(f, &quot;Error reading '{}'&quot;, filename),
+# //!         }
+# //!     }
+# //! }
+# //!
+# //! impl ::std::fmt::Debug for Func1Error {
+# //!     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+# //!         write!(f, &quot;{}&quot;, self)
+# //!     }
+# //! }
+# //!
+# //! fn func1() -&gt; ChainResult&lt;(), Func1Error&gt; {
+# //!     func2().map_err(|e| cherr!(e, Func1Error::Func2))?;
+# //!     let filename = String::from(&quot;bar.txt&quot;);
+# //!     do_some_io().map_err(|e| cherr!(e, Func1Error::IO(filename)))?;
+# //!     Ok(())
+# //! }
+# //!
+# //! fn main() {
+# //!     if let Err(e) = func1() {
+# //!         assert!(
+# //!             match e.kind() {
+# //!                 Func1Error::Func2 =&gt; {
+# //!                     eprintln!(&quot;Main Error Report: func1 error calling func2&quot;);
+# //!                     true
+# //!                 }
+# //!                 Func1Error::IO(filename) =&gt; {
+# //!                     eprintln!(&quot;Main Error Report: func1 error reading '{}'&quot;, filename);
+# //!                     false
+# //!                 }
+# //!             }
+# //!         );
+# //!
+# //!         assert!(e.find_chain_cause::&lt;Func2Error&gt;().is_some());
+# //!
+# //!         if let Some(e) = e.find_chain_cause::&lt;Func2Error&gt;() {
+# //!             eprintln!(&quot;\nError reported by Func2Error: {}&quot;, e)
+# //!         }
+# //!
+# //!
+# //!         assert!(e.root_cause().is_some());
+# //!
+# //!         if let Some(e) = e.root_cause() {
+# //!             let ioerror = e.downcast_ref::&lt;io::Error&gt;().unwrap();
+# //!             eprintln!(&quot;\nThe root cause was: std::io::Error: {:#?}&quot;, ioerror);
+# //!         }
+# //!
+# //!         #[cfg(not(windows))]
+# //!         assert_eq!(
+# //!             format!(&quot;\n{:?}\n&quot;, e), r#&quot;
+# //! src/lib.rs:47: func1 error calling func2
+# //! Caused by:
+# //! src/lib.rs:22: Func2Error(func2 error: calling func3)
+# //! Caused by:
+# //! src/lib.rs:15: Error reading 'foo.txt'
+# //! Caused by:
+# //! Kind(NotFound)
+# //! &quot;#
+# //!         );
+# //!     }
+# //! #    else {
+# //! #        unreachable!();
+# //! #    }
+# //! }
+# //! ~~~
+# 
+# use std::any::TypeId;
+# use std::error::Error;
+# use std::fmt::{Debug, Display, Formatter, Result};
+# 
+# /// chains an inner error kind `T` with a causing error
+# pub struct ChainError&lt;T&gt; {
+#     #[cfg(not(feature = &quot;no-fileline&quot;))]
+#     occurrence: Option&lt;(u32, &amp;'static str)&gt;,
+#     kind: T,
+#     error_cause: Option&lt;Box&lt;dyn Error + 'static&gt;&gt;,
+# }
+# 
+# /// convenience type alias
+# pub type ChainResult&lt;O, E&gt; = std::result::Result&lt;O, ChainError&lt;E&gt;&gt;;
+# 
+# impl&lt;T: 'static + Display + Debug&gt; ChainError&lt;T&gt; {
+#     #[cfg(not(feature = &quot;no-fileline&quot;))]
+#     /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly
+#     pub fn new(
+#         kind: T,
+#         error_cause: Option&lt;Box&lt;dyn Error + 'static&gt;&gt;,
+#         occurrence: Option&lt;(u32, &amp;'static str)&gt;,
+#     ) -&gt; Self {
+#         Self {
+#             occurrence,
+#             kind,
+#             error_cause,
+#         }
+#     }
+# 
+#     #[cfg(feature = &quot;no-fileline&quot;)]
+#     /// Use the `cherr!()` or `mstrerr!()` macro instead of calling this directly
+#     pub fn new(
+#         kind: T,
+#         error_cause: Option&lt;Box&lt;dyn Error + 'static&gt;&gt;,
+#         _occurrence: Option&lt;(u32, &amp;'static str)&gt;,
+#     ) -&gt; Self {
+#         Self { kind, error_cause }
+#     }
+# 
+#     /// return the root cause of the error chain, if any exists
+#     pub fn root_cause(&amp;self) -&gt; Option&lt;&amp;(dyn Error + 'static)&gt; {
+#         self.iter().last()
+#     }
+# 
+#     /// Find the first error cause of type U, if any exists
+#     ///
+#     /// # Examples
+#     ///
+#     /// ~~~rust
+#     /// # use crate::chainerror::*;
+#     /// # use std::error::Error;
+#     /// # use std::io;
+#     /// # use std::result::Result;
+#     /// #
+#     /// fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     Err(io::Error::from(io::ErrorKind::NotFound))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// derive_str_cherr!(Func2Error);
+#     ///
+#     /// fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     let filename = &quot;foo.txt&quot;;
+#     ///     do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// derive_str_cherr!(Func1Error);
+#     ///
+#     /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     func2().map_err(mstrerr!(Func1Error, &quot;func1 error&quot;))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// fn main() {
+#     ///     if let Err(e) = func1() {
+#     ///         if let Some(f1err) = e.downcast_chain_ref::&lt;Func1Error&gt;() {
+#     ///
+#     ///             assert!(f1err.find_cause::&lt;io::Error&gt;().is_some());
+#     ///
+#     ///             assert!(f1err.find_chain_cause::&lt;Func2Error&gt;().is_some());
+#     ///         }
+#     /// #        else {
+#     /// #            panic!();
+#     /// #        }
+#     ///     }
+#     /// #    else {
+#     /// #         unreachable!();
+#     /// #    }
+#     /// }
+#     /// ~~~
+#     pub fn find_cause&lt;U: Error + 'static&gt;(&amp;self) -&gt; Option&lt;&amp;U&gt; {
+#         self.iter().filter_map(Error::downcast_ref::&lt;U&gt;).next()
+#     }
+# 
+#     /// Find the first error cause of type `ChainError&lt;U&gt;`, if any exists
+#     ///
+#     /// Same as `find_cause`, but hides the `ChainError&lt;U&gt;` implementation internals
+#     ///
+#     /// # Examples
+#     ///
+#     /// ~~~rust,ignore
+#     /// // Instead of writing
+#     /// err.find_cause::&lt;ChainError&lt;FooError&gt;&gt;();
+#     ///
+#     /// // leave out the ChainError&lt;FooError&gt; implementation detail
+#     /// err.find_chain_cause::&lt;FooError&gt;();
+#     /// ~~~
+#     pub fn find_chain_cause&lt;U: Error + 'static&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;U&gt;&gt; {
+#         self.iter()
+#             .filter_map(Error::downcast_ref::&lt;ChainError&lt;U&gt;&gt;)
+#             .next()
+#     }
+# 
+#     /// Find the first error cause of type `ChainError&lt;U&gt;` or `U`, if any exists and return `U`
+#     ///
+#     /// Same as `find_cause` and `find_chain_cause`, but hides the `ChainError&lt;U&gt;` implementation internals
+#     ///
+#     /// # Examples
+#     ///
+#     /// ~~~rust,ignore
+#     /// // Instead of writing
+#     /// err.find_cause::&lt;ChainError&lt;FooErrorKind&gt;&gt;();
+#     /// // and/or
+#     /// err.find_chain_cause::&lt;FooErrorKind&gt;();
+#     /// // and/or
+#     /// err.find_cause::&lt;FooErrorKind&gt;();
+#     ///
+#     /// // leave out the ChainError&lt;FooErrorKind&gt; implementation detail
+#     /// err.find_chain_or_kind::&lt;FooErrorKind&gt;();
+#     /// ~~~
+#     pub fn find_kind_or_cause&lt;U: Error + 'static&gt;(&amp;self) -&gt; Option&lt;&amp;U&gt; {
+#         self.iter()
+#             .filter_map(|e| {
+#                 e.downcast_ref::&lt;ChainError&lt;U&gt;&gt;()
+#                     .map(|e| e.kind())
+#                     .or_else(|| e.downcast_ref::&lt;U&gt;())
+#             })
+#             .next()
+#     }
+# 
+#     /// Return a reference to T of `ChainError&lt;T&gt;`
+#     ///
+#     /// # Examples
+#     ///
+#     /// ~~~rust
+#     /// # use crate::chainerror::*;
+#     /// # use std::error::Error;
+#     /// # use std::io;
+#     /// # use std::result::Result;
+#     /// #
+#     /// fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     Err(io::Error::from(io::ErrorKind::NotFound))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// derive_str_cherr!(Func2Error);
+#     ///
+#     /// fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+#     ///     let filename = &quot;foo.txt&quot;;
+#     ///     do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// #[derive(Debug)]
+#     /// enum Func1ErrorKind {
+#     ///     Func2,
+#     ///     IO(String),
+#     /// }
+#     ///
+#     /// /// impl ::std::fmt::Display for Func1ErrorKind {…}
+#     /// # impl ::std::fmt::Display for Func1ErrorKind {
+#     /// #     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+#     /// #         match self {
+#     /// #             Func1ErrorKind::Func2 =&gt; write!(f, &quot;func1 error calling func2&quot;),
+#     /// #             Func1ErrorKind::IO(filename) =&gt; write!(f, &quot;Error reading '{}'&quot;, filename),
+#     /// #         }
+#     /// #     }
+#     /// # }
+#     ///
+#     /// fn func1() -&gt; ChainResult&lt;(), Func1ErrorKind&gt; {
+#     ///     func2().map_err(|e| cherr!(e, Func1ErrorKind::Func2))?;
+#     ///     do_some_io().map_err(|e| cherr!(e, Func1ErrorKind::IO(&quot;bar.txt&quot;.into())))?;
+#     ///     Ok(())
+#     /// }
+#     ///
+#     /// fn main() {
+#     ///     if let Err(e) = func1() {
+#     ///         match e.kind() {
+#     ///             Func1ErrorKind::Func2 =&gt; {},
+#     ///             Func1ErrorKind::IO(filename) =&gt; panic!(),
+#     ///         }
+#     ///     }
+#     /// #    else {
+#     /// #         unreachable!();
+#     /// #    }
+#     /// }
+#     /// ~~~
+#     pub fn kind(&amp;self) -&gt; &amp;T {
+#         &amp;self.kind
+#     }
+# 
+#     /// Returns an Iterator over all error causes/sources
+#     ///
+#     /// # Example
+#     ///
+#     ///
+#     pub fn iter(&amp;self) -&gt; impl Iterator&lt;Item = &amp;(dyn Error + 'static)&gt; {
+#         ErrorIter {
+#             current: Some(self),
+#         }
+#     }
+# }
+# 
+# struct ErrorIter&lt;'a&gt; {
+#     current: Option&lt;&amp;'a (dyn Error + 'static)&gt;,
+# }
+# 
+# impl&lt;'a&gt; Iterator for ErrorIter&lt;'a&gt; {
+#     type Item = &amp;'a (dyn Error + 'static);
+# 
+#     fn next(&amp;mut self) -&gt; Option&lt;Self::Item&gt; {
+#         let current = self.current;
+#         self.current = self.current.and_then(Error::source);
+#         current
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; std::ops::Deref for ChainError&lt;T&gt; {
+#     type Target = T;
+# 
+#     fn deref(&amp;self) -&gt; &amp;Self::Target {
+#         &amp;self.kind
+#     }
+# }
+# 
+# /// Convenience trait to hide the `ChainError&lt;T&gt;` implementation internals
+# pub trait ChainErrorDown {
+#     /// Test if of type `ChainError&lt;T&gt;`
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool;
+#     /// Downcast to a reference of `ChainError&lt;T&gt;`
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt;;
+#     /// Downcast to a mutable reference of `ChainError&lt;T&gt;`
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt;;
+# }
+# 
+# impl&lt;U: 'static + Display + Debug&gt; ChainErrorDown for ChainError&lt;U&gt; {
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool {
+#         TypeId::of::&lt;T&gt;() == TypeId::of::&lt;U&gt;()
+#     }
+# 
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt; {
+#         if self.is_chain::&lt;T&gt;() {
+#             #[allow(clippy::cast_ptr_alignment)]
+#             unsafe {
+#                 Some(&amp;*(self as *const dyn Error as *const &amp;ChainError&lt;T&gt;))
+#             }
+#         } else {
+#             None
+#         }
+#     }
+# 
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt; {
+#         if self.is_chain::&lt;T&gt;() {
+#             #[allow(clippy::cast_ptr_alignment)]
+#             unsafe {
+#                 Some(&amp;mut *(self as *mut dyn Error as *mut &amp;mut ChainError&lt;T&gt;))
+#             }
+#         } else {
+#             None
+#         }
+#     }
+# }
+# 
+# impl ChainErrorDown for dyn Error + 'static {
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool {
+#         self.is::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt; {
+#         self.downcast_ref::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt; {
+#         self.downcast_mut::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# }
+# 
+# impl ChainErrorDown for dyn Error + 'static + Send {
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool {
+#         self.is::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt; {
+#         self.downcast_ref::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt; {
+#         self.downcast_mut::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# }
+# 
+# impl ChainErrorDown for dyn Error + 'static + Send + Sync {
+#     fn is_chain&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; bool {
+#         self.is::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_ref&lt;T: 'static + Display + Debug&gt;(&amp;self) -&gt; Option&lt;&amp;ChainError&lt;T&gt;&gt; {
+#         self.downcast_ref::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# 
+#     fn downcast_chain_mut&lt;T: 'static + Display + Debug&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut ChainError&lt;T&gt;&gt; {
+#         self.downcast_mut::&lt;ChainError&lt;T&gt;&gt;()
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Error for ChainError&lt;T&gt; {
+#     fn source(&amp;self) -&gt; Option&lt;&amp;(dyn Error + 'static)&gt; {
+#         self.error_cause.as_ref().map(|e| e.as_ref())
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Error for &amp;ChainError&lt;T&gt; {
+#     fn source(&amp;self) -&gt; Option&lt;&amp;(dyn Error + 'static)&gt; {
+#         self.error_cause.as_ref().map(|e| e.as_ref())
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Error for &amp;mut ChainError&lt;T&gt; {
+#     fn source(&amp;self) -&gt; Option&lt;&amp;(dyn Error + 'static)&gt; {
+#         self.error_cause.as_ref().map(|e| e.as_ref())
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Display for ChainError&lt;T&gt; {
+#     fn fmt(&amp;self, f: &amp;mut Formatter) -&gt; Result {
+#         write!(f, &quot;{}&quot;, self.kind)?;
+# 
+#         #[cfg(feature = &quot;display-cause&quot;)]
+#         {
+#             if let Some(e) = self.source() {
+#                 writeln!(f, &quot;\nCaused by:&quot;)?;
+#                 Display::fmt(&amp;e, f)?;
+#             }
+#         }
+#         Ok(())
+#     }
+# }
+# 
+# impl&lt;T: 'static + Display + Debug&gt; Debug for ChainError&lt;T&gt; {
+#     fn fmt(&amp;self, f: &amp;mut Formatter) -&gt; Result {
+#         #[cfg(not(feature = &quot;no-fileline&quot;))]
+#         {
+#             if let Some(o) = self.occurrence {
+#                 write!(f, &quot;{}:{}: &quot;, o.1, o.0)?;
+#             }
+#         }
+# 
+#         if self.is_chain::&lt;String&gt;() {
+#             Display::fmt(&amp;self.kind, f)?;
+#         } else {
+#             Debug::fmt(&amp;self.kind, f)?;
+#         }
+# 
+#         #[cfg(not(feature = &quot;no-debug-cause&quot;))]
+#         {
+#             if let Some(e) = self.source() {
+#                 writeln!(f, &quot;\nCaused by:&quot;)?;
+#                 Debug::fmt(&amp;e, f)?;
+#             }
+#         }
+#         Ok(())
+#     }
+# }
+# 
+# pub trait ChainErrorFrom&lt;T&gt;: Sized {
+#     fn chain_error_from(_: T, line_filename: Option&lt;(u32, &amp;'static str)&gt;) -&gt; ChainError&lt;Self&gt;;
+# }
+# 
+# pub trait IntoChainError&lt;T&gt;: Sized {
+#     fn into_chain_error(self, line_filename: Option&lt;(u32, &amp;'static str)&gt;) -&gt; ChainError&lt;T&gt;;
+# }
+# 
+# impl&lt;T, U&gt; IntoChainError&lt;U&gt; for T
+# where
+#     U: ChainErrorFrom&lt;T&gt;,
+# {
+#     fn into_chain_error(self, line_filename: Option&lt;(u32, &amp;'static str)&gt;) -&gt; ChainError&lt;U&gt; {
+#         U::chain_error_from(self, line_filename)
+#     }
+# }
+# 
+# impl&lt;T, U&gt; ChainErrorFrom&lt;T&gt; for U
+# where
+#     T: Into&lt;U&gt;,
+#     U: 'static + Display + Debug,
+# {
+#     fn chain_error_from(t: T, line_filename: Option&lt;(u32, &amp;'static str)&gt;) -&gt; ChainError&lt;Self&gt; {
+#         let e: U = t.into();
+#         ChainError::&lt;_&gt;::new(e, None, line_filename)
+#     }
+# }
+# 
+# #[macro_export]
+# macro_rules! minto_cherr {
+#     ( ) =&gt; {
+#         |e| e.into_chain_error(Some((line!(), file!())))
+#     };
+# }
+# 
+# #[macro_export]
+# macro_rules! into_cherr {
+#     ( $t:expr ) =&gt; {
+#         $t.into_chain_error(Some((line!(), file!())))
+#     };
+# }
+# 
+# /// Creates a new `ChainError&lt;T&gt;`
+# ///
+# /// # Examples
+# ///
+# /// Create a new ChainError&lt;FooError&gt;, where `FooError` must implement `Display` and `Debug`.
+# /// ~~~rust
+# /// # use chainerror::*;
+# /// #
+# /// # #[derive(Debug)]
+# /// enum FooError {
+# ///     Bar,
+# ///     Baz(&amp;'static str),
+# /// }
+# /// #
+# /// # impl ::std::fmt::Display for FooError {
+# /// #     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+# /// #         match self {
+# /// #             FooError::Bar =&gt; write!(f, &quot;Bar Error&quot;),
+# /// #             FooError::Baz(s) =&gt; write!(f, &quot;Baz Error: '{}'&quot;, s),
+# /// #         }
+# /// #     }
+# /// # }
+# ///
+# /// //  impl ::std::fmt::Display for FooError
+# ///
+# /// fn do_some_stuff() -&gt; bool {
+# ///     false
+# /// }
+# ///
+# /// fn func() -&gt; ChainResult&lt;(), FooError&gt; {
+# ///     if ! do_some_stuff() {
+# ///         Err(cherr!(FooError::Baz(&quot;Error&quot;)))?;
+# ///     }
+# ///     Ok(())
+# /// }
+# /// #
+# /// # pub fn main() {
+# /// #     match func().unwrap_err().kind() {
+# /// #         FooError::Baz(s) if s == &amp;&quot;Error&quot; =&gt; {},
+# /// #         _ =&gt; panic!(),
+# /// #     }
+# /// # }
+# /// ~~~
+# ///
+# /// Additionally an error cause can be added.
+# ///
+# /// ~~~rust
+# /// # use chainerror::*;
+# /// # use std::io;
+# /// # use std::error::Error;
+# /// #
+# /// # #[derive(Debug)]
+# /// # enum FooError {
+# /// #     Bar,
+# /// #     Baz(&amp;'static str),
+# /// # }
+# /// #
+# /// # impl ::std::fmt::Display for FooError {
+# /// #     fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+# /// #         match self {
+# /// #             FooError::Bar =&gt; write!(f, &quot;Bar Error&quot;),
+# /// #             FooError::Baz(s) =&gt; write!(f, &quot;Baz Error: '{}'&quot;, s),
+# /// #         }
+# /// #     }
+# /// # }
+# /// #
+# /// fn do_some_stuff() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// fn func() -&gt; ChainResult&lt;(), FooError&gt; {
+# ///     do_some_stuff().map_err(
+# ///         |e| cherr!(e, FooError::Baz(&quot;Error&quot;))
+# ///     )?;
+# ///     Ok(())
+# /// }
+# /// #
+# /// # pub fn main() {
+# /// #     match func().unwrap_err().kind() {
+# /// #         FooError::Baz(s) if s == &amp;&quot;Error&quot; =&gt; {},
+# /// #         _ =&gt; panic!(),
+# /// #     }
+# /// # }
+# /// ~~~
+# #[macro_export]
+# macro_rules! cherr {
+#     ( $k:expr ) =&gt; ({
+#         ChainError::&lt;_&gt;::new($k, None, Some((line!(), file!())))
+#     });
+#     ( None, $k:expr ) =&gt; ({
+#         ChainError::&lt;_&gt;::new($k, None, Some((line!(), file!())))
+#     });
+#     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         cherr!(None, format!($fmt, $($arg)+ ))
+#     });
+#     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         cherr!(None, format!($fmt, $($arg)+ ))
+#     });
+#     ( $e:path, $k:expr ) =&gt; ({
+#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
+#     });
+#     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         cherr!($e, format!($fmt, $($arg)+ ))
+#     });
+# 
+# }
+# 
+# /// Convenience macro for `|e| cherr!(e, format!(…))`
+# ///
+# /// # Examples
+# ///
+# /// ~~~rust
+# /// # use crate::chainerror::*;
+# /// # use std::error::Error;
+# /// # use std::io;
+# /// # use std::result::Result;
+# /// #
+# /// # fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# /// #     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# /// #     Ok(())
+# /// # }
+# /// #
+# /// fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     let filename = &quot;foo.txt&quot;;
+# ///     do_some_io().map_err(mstrerr!(&quot;Error reading '{}'&quot;, filename))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     func2().map_err(mstrerr!(&quot;func1 error&quot;))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// # fn main() {
+# /// #     if let Err(e) = func1() {
+# /// #         #[cfg(not(windows))]
+# /// #         assert_eq!(
+# /// #             format!(&quot;\n{:?}\n&quot;, e), r#&quot;
+# /// # src/lib.rs:20: func1 error
+# /// # Caused by:
+# /// # src/lib.rs:15: Error reading 'foo.txt'
+# /// # Caused by:
+# /// # Kind(NotFound)
+# /// # &quot;#
+# /// #         );
+# /// #     } else {
+# /// #         unreachable!();
+# /// #     }
+# /// # }
+# /// ~~~
+# ///
+# /// `mstrerr!()` can also be used to map a new `ChainError&lt;T&gt;`, where T was defined with
+# /// `derive_str_cherr!(T)`
+# ///
+# /// ~~~rust
+# /// # use crate::chainerror::*;
+# /// # use std::error::Error;
+# /// # use std::io;
+# /// # use std::result::Result;
+# /// #
+# /// # fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# /// #     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# /// #     Ok(())
+# /// # }
+# /// #
+# /// derive_str_cherr!(Func2Error);
+# ///
+# /// fn func2() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     let filename = &quot;foo.txt&quot;;
+# ///     do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// derive_str_cherr!(Func1Error);
+# ///
+# /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     func2().map_err(mstrerr!(Func1Error, &quot;func1 error&quot;))?;
+# ///     Ok(())
+# /// }
+# /// #
+# /// # fn main() {
+# /// #     if let Err(e) = func1() {
+# /// #         if let Some(f1err) = e.downcast_chain_ref::&lt;Func1Error&gt;() {
+# /// #             assert!(f1err.find_cause::&lt;ChainError&lt;Func2Error&gt;&gt;().is_some());
+# /// #             assert!(f1err.find_chain_cause::&lt;Func2Error&gt;().is_some());
+# /// #         } else {
+# /// #             panic!();
+# /// #         }
+# /// #     } else {
+# /// #         unreachable!();
+# /// #     }
+# /// # }
+# /// ~~~
+# #[macro_export]
+# macro_rules! mstrerr {
+#     ( $t:path, $msg:expr ) =&gt; ({
+#         |e| cherr!(e, $t ($msg.to_string()))
+#     });
+#     ( $t:path, $msg:expr, ) =&gt; ({
+#         |e| cherr!(e, $t ($msg.to_string()))
+#     });
+#     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
+#     });
+#     ($msg:expr) =&gt; ({
+#         |e| cherr!(e, $msg.to_string())
+#     });
+#     ($msg:expr, ) =&gt; ({
+#         |e| cherr!(e, $msg.to_string())
+#     });
+#     ($fmt:expr, $($arg:tt)+) =&gt; ({
+#         |e| cherr!(e, format!($fmt, $($arg)+ ))
+#     });
+# }
+# 
+# /// Convenience macro for `cherr!(T(format!(…)))` where `T(String)`
+# ///
+# /// # Examples
+# ///
+# /// ~~~rust
+# /// # use crate::chainerror::*;
+# /// # use std::error::Error;
+# /// # use std::result::Result;
+# /// #
+# /// derive_str_cherr!(Func2Error);
+# ///
+# /// fn func2() -&gt; ChainResult&lt;(), Func2Error&gt; {
+# ///     let filename = &quot;foo.txt&quot;;
+# ///     Err(strerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))
+# /// }
+# ///
+# /// derive_str_cherr!(Func1Error);
+# ///
+# /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     func2().map_err(mstrerr!(Func1Error, &quot;func1 error&quot;))?;
+# ///     Ok(())
+# /// }
+# /// #
+# /// # fn main() {
+# /// #     if let Err(e) = func1() {
+# /// #         if let Some(f1err) = e.downcast_chain_ref::&lt;Func1Error&gt;() {
+# /// #             assert!(f1err.find_cause::&lt;ChainError&lt;Func2Error&gt;&gt;().is_some());
+# /// #             assert!(f1err.find_chain_cause::&lt;Func2Error&gt;().is_some());
+# /// #         } else {
+# /// #             panic!();
+# /// #         }
+# /// #     } else {
+# /// #         unreachable!();
+# /// #     }
+# /// # }
+# /// ~~~
+# #[macro_export]
+# macro_rules! strerr {
+#     ( $t:path, $msg:expr ) =&gt; ({
+#         cherr!($t ($msg.to_string()))
+#     });
+#     ( $t:path, $msg:expr, ) =&gt; ({
+#         cherr!($t ($msg.to_string()))
+#     });
+#     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
+#         cherr!($t (format!($fmt, $($arg)+ )))
+#     });
+#     ($msg:expr) =&gt; ({
+#         cherr!($msg.to_string())
+#     });
+#     ($msg:expr, ) =&gt; ({
+#         cherr!($msg.to_string())
+#     });
+#     ($fmt:expr, $($arg:tt)+) =&gt; ({
+#         cherr!(format!($fmt, $($arg)+ ))
+#     });
+# }
+# 
+# /// Convenience macro to create a &quot;new type&quot; T(String) and implement Display + Debug for T
+# ///
+# /// # Examples
+# ///
+# /// ~~~rust
+# /// # use crate::chainerror::*;
+# /// # use std::error::Error;
+# /// # use std::io;
+# /// # use std::result::Result;
+# /// #
+# /// # fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# /// #     Err(io::Error::from(io::ErrorKind::NotFound))?;
+# /// #     Ok(())
+# /// # }
+# /// #
+# /// derive_str_cherr!(Func2Error);
+# ///
+# /// fn func2() -&gt; ChainResult&lt;(), Func2Error&gt; {
+# ///     let filename = &quot;foo.txt&quot;;
+# ///     do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+# ///     Ok(())
+# /// }
+# ///
+# /// derive_str_cherr!(Func1Error);
+# ///
+# /// fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
+# ///     func2().map_err(mstrerr!(Func1Error, &quot;func1 error&quot;))?;
+# ///     Ok(())
+# /// }
+# /// #
+# /// # fn main() {
+# /// #     if let Err(e) = func1() {
+# /// #         if let Some(f1err) = e.downcast_chain_ref::&lt;Func1Error&gt;() {
+# /// #             assert!(f1err.find_cause::&lt;ChainError&lt;Func2Error&gt;&gt;().is_some());
+# /// #             assert!(f1err.find_chain_cause::&lt;Func2Error&gt;().is_some());
+# /// #         } else {
+# /// #             panic!();
+# /// #         }
+# /// #     } else {
+# /// #         unreachable!();
+# /// #     }
+# /// # }
+# /// ~~~
+# #[macro_export]
+# macro_rules! derive_str_cherr {
+#     ($e:ident) =&gt; {
+#         pub struct $e(pub String);
+#         impl ::std::fmt::Display for $e {
+#             fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+#                 write!(f, &quot;{}&quot;, self.0)
+#             }
+#         }
+#         impl ::std::fmt::Debug for $e {
+#             fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+#                 write!(f, &quot;{}({})&quot;, stringify!($e), self.0)
+#             }
+#         }
+#         impl ::std::error::Error for $e {}
+#     };
+# }
+# }
+pub mod mycrate {
+    use crate::chainerror::*; // omit the `crate::` part
+    use std::io;
+
+    fn do_some_io() -&gt; std::result::Result&lt;(), Box&lt;std::error::Error&gt;&gt; {
+        Err(io::Error::from(io::ErrorKind::NotFound))?;
+        Ok(())
+    }
+
+    derive_str_cherr!(Func2Error);
+
+    fn func2() -&gt; std::result::Result&lt;(), Box&lt;std::error::Error&gt;&gt; {
+        let filename = &quot;foo.txt&quot;;
+        do_some_io().map_err(mstrerr!(Func2Error, &quot;Error reading '{}'&quot;, filename))?;
+        Ok(())
+    }
+
+    #[derive(Debug)]
+    pub enum ErrorKind {
+        Func2,
+        IO(String),
+    }
+
+    pub type Error = ChainError&lt;ErrorKind&gt;;
+    pub type Result&lt;T&gt; = std::result::Result&lt;T, Error&gt;;
+
+    impl ::std::fmt::Display for ErrorKind {
+        fn fmt(&amp;self, f: &amp;mut ::std::fmt::Formatter) -&gt; ::std::fmt::Result {
+            match self {
+                ErrorKind::Func2 =&gt; write!(f, &quot;func1 error calling func2&quot;),
+                ErrorKind::IO(filename) =&gt; write!(f, &quot;Error reading '{}'&quot;, filename),
+            }
+        }
+    }
+
+    pub fn func1() -&gt; Result&lt;()&gt; {
+        func2().map_err(|e| cherr!(e, ErrorKind::Func2))?;
+        let filename = String::from(&quot;bar.txt&quot;);
+        do_some_io().map_err(|e| cherr!(e, ErrorKind::IO(filename)))?;
+        Ok(())
+    }
+}
+
+fn main() -&gt; Result&lt;(), Box&lt;std::error::Error&gt;&gt; {
+    use mycrate::func1;
+    use mycrate::ErrorKind;
+    use std::error::Error;
+    use std::io;
+
+    if let Err(e) = func1() {
+        match e.kind() {
+            ErrorKind::Func2 =&gt; eprintln!(&quot;Main Error Report: func1 error calling func2&quot;),
+            ErrorKind::IO(ref filename) =&gt; {
+                eprintln!(&quot;Main Error Report: func1 error reading '{}'&quot;, filename)
+            }
+        }
+
+        eprintln!();
+        let mut s : &amp;Error = &amp;e;
+        while let Some(c) = s.source() {
+            if let Some(ioerror) = c.downcast_ref::&lt;io::Error&gt;() {
+                eprintln!(&quot;caused by: std::io::Error: {}&quot;, ioerror);
+                match ioerror.kind() {
+                    io::ErrorKind::NotFound =&gt; eprintln!(&quot;of kind: std::io::ErrorKind::NotFound&quot;),
+                    _ =&gt; {}
+                }
+            } else {
+                eprintln!(&quot;caused by: {}&quot;, c);
+            }
+            s = c;
+        }
+
+        eprintln!(&quot;\nDebug Error:\n{:?}&quot;, e);
+    }
+    Ok(())
+}
+</code></pre></pre>
+
+                    </main>
+
+                    <nav class="nav-wrapper" aria-label="Page navigation">
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diff --git a/tutorial2.html b/tutorial2.html
index 9e3e96d..a901049 100644
--- a/tutorial2.html
+++ b/tutorial2.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html" class="active"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html" class="active"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -144,7 +144,7 @@
 <p>With relatively small changes and the help of the <code>cherr!</code> macro of the <code>chainerror</code> crate
 the <code>String</code> errors are now chained together.</p>
 <p>Press the play button in the upper right corner and see the nice debug output.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 
 use std::error::Error;
 use std::io;
@@ -172,6 +172,7 @@ fn func1() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     func1()
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -860,15 +861,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -963,21 +958,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1030,21 +1016,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial3.html b/tutorial3.html
index 1433bb0..ad15d97 100644
--- a/tutorial3.html
+++ b/tutorial3.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html" class="active"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html" class="active"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -142,7 +142,7 @@
                     <main>
                         <a class="header" href="#mapping-errors" id="mapping-errors"><h1>Mapping Errors</h1></a>
 <p>Now let's get more rust idiomatic by using <code>.map_err()</code>.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 
 use std::error::Error;
 use std::io;
@@ -169,6 +169,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -857,15 +858,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -960,21 +955,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1027,21 +1013,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial4.html b/tutorial4.html
index 26bc160..2a2d408 100644
--- a/tutorial4.html
+++ b/tutorial4.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html" class="active"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html" class="active"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -146,7 +146,7 @@ let you jump through hoops, <code>chainerror</code> has a quick macro for that.<
 <p><code>mstrerror!()</code> fits right into <code>.map_err()</code> letting you quickly add
 more debug strings.</p>
 <p><code>mstrerror!()</code> even understands <code>format!()</code> syntax like <code>println!()</code>.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -173,6 +173,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -861,15 +862,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -964,21 +959,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1031,21 +1017,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial5.html b/tutorial5.html
index a3efd72..6dc0a6c 100644
--- a/tutorial5.html
+++ b/tutorial5.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html" class="active"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html" class="active"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -143,7 +143,7 @@
                         <a class="header" href="#the-source-of-errors" id="the-source-of-errors"><h1>The source() of Errors</h1></a>
 <p>Sometimes you want to inspect the <code>source()</code> of an <code>Error</code>.
 <code>chainerror</code> implements <code>std::error::Error::source()</code>, so you can get the cause of an error.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -175,6 +175,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -863,15 +864,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -966,21 +961,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1033,21 +1019,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial6.html b/tutorial6.html
index 19f8e6a..813b1f3 100644
--- a/tutorial6.html
+++ b/tutorial6.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html" class="active"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html" class="active"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -147,7 +147,7 @@
 pub fn downcast_mut&lt;T: Error + 'static&gt;(&amp;mut self) -&gt; Option&lt;&amp;mut T&gt;
 </code></pre>
 <p>This is how it looks like, when using those:</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -187,6 +187,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -875,15 +876,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -978,21 +973,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1045,21 +1031,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial7.html b/tutorial7.html
index 7c0362d..dd93bcb 100644
--- a/tutorial7.html
+++ b/tutorial7.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html" class="active"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html" class="active"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -158,7 +158,7 @@ to call <code>.find_cause::&lt;io::Error&gt;()</code>.</p>
 <p>or to use <code>.root_cause()</code>, which of course can be of any type implementing <code>std::error::Error</code>.</p>
 <pre><code class="language-rust ignore">            if let Some(e) = s.root_cause() {
 </code></pre>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -199,6 +199,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -887,15 +888,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -990,21 +985,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1057,21 +1043,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial8.html b/tutorial8.html
index 385ebbd..4582b1e 100644
--- a/tutorial8.html
+++ b/tutorial8.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html" class="active"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html" class="active"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -155,7 +155,7 @@ derive_str_cherr!(Func1Error);
 <pre><code class="language-rust ignore">            if let Some(f2err) = f1err.find_cause::&lt;ChainError&lt;Func2Error&gt;&gt;() {
 </code></pre>
 <p>hiding the <code>ChainError&lt;T&gt;</code> implementation detail.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -196,6 +196,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -884,15 +885,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -987,21 +982,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1054,21 +1040,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });
diff --git a/tutorial9.html b/tutorial9.html
index f48975f..d07e88b 100644
--- a/tutorial9.html
+++ b/tutorial9.html
@@ -75,7 +75,7 @@
         </script>
 
         <nav id="sidebar" class="sidebar" aria-label="Table of contents">
-            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html" class="active"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
+            <ol class="chapter"><li class="affix"><a href="index.html">chainerror</a></li><li><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li><a href="tutorial9.html" class="active"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="affix"><a href="end.html">The End</a></li></ol>
         </nav>
 
         <div id="page-wrapper" class="page-wrapper">
@@ -159,7 +159,7 @@
 </code></pre>
 <p>but this is not valid rust code, so we end up doing it the hard way.
 In the next chapter, we will see, how to solve this more elegantly.</p>
-<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
+<pre><pre class="playpen"><code class="language-rust">use chainerror::*;
 use std::error::Error;
 use std::io;
 use std::result::Result;
@@ -199,6 +199,7 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
     }
     Ok(())
 }
+
 # #[allow(dead_code)]
 # mod chainerror {
 # //! `chainerror` provides an error backtrace without doing a real backtrace, so even after you `strip` your
@@ -887,15 +888,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 #     ( None, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!(None, format!($fmt, $($arg)+ ))
 #     });
-#     ( $e:ident, $k:expr ) =&gt; ({
-#         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
-#     });
 #     ( $e:path, $k:expr ) =&gt; ({
 #         ChainError::&lt;_&gt;::new($k, Some(Box::from($e)), Some((line!(), file!())))
 #     });
-#     ( $e:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($e, format!($fmt, $($arg)+ ))
-#     });
 #     ( $e:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($e, format!($fmt, $($arg)+ ))
 #     });
@@ -990,21 +985,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! mstrerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         |e| cherr!(e, $t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         |e| cherr!(e, $t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         |e| cherr!(e, $t (format!($fmt, $($arg)+ )))
 #     });
@@ -1057,21 +1043,12 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
 # /// ~~~
 # #[macro_export]
 # macro_rules! strerr {
-#     ( $t:ident, $msg:expr ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $msg:expr, ) =&gt; ({
-#         cherr!($t ($msg.to_string()))
-#     });
 #     ( $t:path, $msg:expr, ) =&gt; ({
 #         cherr!($t ($msg.to_string()))
 #     });
-#     ( $t:ident, $fmt:expr, $($arg:tt)+ ) =&gt; ({
-#         cherr!($t (format!($fmt, $($arg)+ )))
-#     });
 #     ( $t:path, $fmt:expr, $($arg:tt)+ ) =&gt; ({
 #         cherr!($t (format!($fmt, $($arg)+ )))
 #     });