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<ol class="chapter"><li class="expanded affix "><a href="index.html">chainerror</a></li><li class="expanded "><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li class="expanded "><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li class="expanded "><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li class="expanded "><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> Saving coding chars</a></li><li class="expanded "><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li class="expanded "><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li class="expanded "><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li class="expanded "><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li class="expanded "><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li class="expanded "><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li class="expanded "><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li class="expanded "><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="expanded "><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="expanded "><a href="tutorial14.html" class="active"><strong aria-hidden="true">14.</strong> Going back to std</a></li><li class="expanded affix "><a href="end.html">The End</a></li></ol>
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<ol class="chapter"><li class="chapter-item expanded affix "><a href="index.html">chainerror</a></li><li class="chapter-item expanded "><a href="tutorial1.html"><strong aria-hidden="true">1.</strong> Simple String Errors</a></li><li class="chapter-item expanded "><a href="tutorial2.html"><strong aria-hidden="true">2.</strong> Simple Chained String Errors</a></li><li class="chapter-item expanded "><a href="tutorial3.html"><strong aria-hidden="true">3.</strong> Mapping Errors</a></li><li class="chapter-item expanded "><a href="tutorial4.html"><strong aria-hidden="true">4.</strong> More Information</a></li><li class="chapter-item expanded "><a href="tutorial5.html"><strong aria-hidden="true">5.</strong> The source() of Errors</a></li><li class="chapter-item expanded "><a href="tutorial6.html"><strong aria-hidden="true">6.</strong> Downcast the Errors</a></li><li class="chapter-item expanded "><a href="tutorial7.html"><strong aria-hidden="true">7.</strong> The root cause of all Errors</a></li><li class="chapter-item expanded "><a href="tutorial8.html"><strong aria-hidden="true">8.</strong> Finding an Error cause</a></li><li class="chapter-item expanded "><a href="tutorial9.html"><strong aria-hidden="true">9.</strong> Selective Error Handling</a></li><li class="chapter-item expanded "><a href="tutorial10.html"><strong aria-hidden="true">10.</strong> ErrorKind to the rescue</a></li><li class="chapter-item expanded "><a href="tutorial11.html"><strong aria-hidden="true">11.</strong> Debug for the ErrorKind</a></li><li class="chapter-item expanded "><a href="tutorial12.html"><strong aria-hidden="true">12.</strong> Deref for the ErrorKind</a></li><li class="chapter-item expanded "><a href="tutorial13.html"><strong aria-hidden="true">13.</strong> Writing a library</a></li><li class="chapter-item expanded "><a href="tutorial14.html" class="active"><strong aria-hidden="true">14.</strong> Going back to std</a></li><li class="chapter-item expanded affix "><a href="end.html">The End</a></li></ol>
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<h1 class="menu-title">chainerror</h1>
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@ -151,10 +162,10 @@
<h1><a class="header" href="#going-back-to-std" id="going-back-to-std">Going back to std</a></h1>
<p>Not using <code>chainerror</code> and going full <code>std</code> would look like this:</p>
<p>Btw, the code size is bigger than using <code>chainerror</code> :-)</p>
<pre><pre class="playpen"><code class="language-rust">pub mod mycrate {
<pre><pre class="playground"><code class="language-rust">pub mod mycrate {
use std::error::Error as StdError;
use func2mod::{do_some_io, func2};
use self::func2mod::{do_some_io, func2};
pub mod func2mod {
use std::error::Error as StdError;
@ -180,7 +191,7 @@
}
}
macro_rules! mcherr {
macro_rules! mcontext {
( $k:expr ) =&gt; {{
|e| {
Error(
@ -245,7 +256,7 @@
pub fn func2() -&gt; std::result::Result&lt;(), Error&gt; {
let filename = &quot;foo.txt&quot;;
do_some_io().map_err(mcherr!(ErrorKind::IO(format!(
do_some_io().map_err(mcontext!(ErrorKind::IO(format!(
&quot;Error reading '{}'&quot;,
filename
))))?;
@ -268,7 +279,7 @@
}
}
macro_rules! mcherr {
macro_rules! mcontext {
( $k:expr ) =&gt; {{
|e| {
Error(
@ -328,9 +339,9 @@
pub type Result&lt;T&gt; = std::result::Result&lt;T, Error&gt;;
pub fn func1() -&gt; Result&lt;()&gt; {
func2().map_err(mcherr!(ErrorKind::Func2))?;
func2().map_err(mcontext!(ErrorKind::Func2))?;
let filename = String::from(&quot;bar.txt&quot;);
do_some_io().map_err(mcherr!(ErrorKind::IO(filename)))?;
do_some_io().map_err(mcontext!(ErrorKind::IO(filename)))?;
Ok(())
}
}
@ -365,6 +376,8 @@ fn main() -&gt; Result&lt;(), Box&lt;dyn std::error::Error + Send + Sync&gt;&gt;
}
eprintln!(&quot;\nDebug Error:\n{:?}&quot;, e);
std::process::exit(1);
}
Ok(())
}
@ -393,13 +406,13 @@ fn main() -&gt; Result&lt;(), Box&lt;dyn std::error::Error + Send + Sync&gt;&gt;
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@ -412,10 +425,10 @@ fn main() -&gt; Result&lt;(), Box&lt;dyn std::error::Error + Send + Sync&gt;&gt;
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