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Harald Hoyer 2018-12-20 15:12:59 +01:00
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commit 991a7a0786
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<div id="content" class="content">
<main>
<pre><pre class="playpen"><code class="language-rust">use std::error::Error;
<a class="header" href="#simple-string-errors" id="simple-string-errors"><h1>Simple String Errors</h1></a>
<p>The most simplest of doing error handling in rust is by returning <code>String</code> as a <code>Box&lt;Error&gt;</code>.</p>
<p>As you can see by running the example, this only prints out the last <code>Error</code>.</p>
<p>If the rust <code>main</code> function returns an Err(), this Err() will be displayed with <code>std::fmt::Debug</code>.</p>
<pre><pre class="playpen"><code class="language-rust">use std::error::Error;
use std::result::Result;
fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {

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<div id="content" class="content">
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<pre><pre class="playpen"><code class="language-rust">use std::error::Error;
<a class="header" href="#simple-string-errors" id="simple-string-errors"><h1>Simple String Errors</h1></a>
<p>The most simplest of doing error handling in rust is by returning <code>String</code> as a <code>Box&lt;Error&gt;</code>.</p>
<p>As you can see by running the example, this only prints out the last <code>Error</code>.</p>
<p>If the rust <code>main</code> function returns an Err(), this Err() will be displayed with <code>std::fmt::Debug</code>.</p>
<pre><pre class="playpen"><code class="language-rust">use std::error::Error;
use std::result::Result;
fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
@ -166,6 +170,9 @@ fn main() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {
func1()
}
</code></pre></pre>
<a class="header" href="#simple-chained-string-errors" id="simple-chained-string-errors"><h1>Simple Chained String Errors</h1></a>
<p>Now with the help of the <code>chainerror</code> crate, we can have a nicer output.</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::*;
use std::error::Error;
use std::result::Result;

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<div id="content" class="content">
<main>
<pre><pre class="playpen"><code class="language-rust">use std::error::Error;
<a class="header" href="#simple-string-errors" id="simple-string-errors"><h1>Simple String Errors</h1></a>
<p>The most simplest of doing error handling in rust is by returning <code>String</code> as a <code>Box&lt;Error&gt;</code>.</p>
<p>As you can see by running the example, this only prints out the last <code>Error</code>.</p>
<p>If the rust <code>main</code> function returns an Err(), this Err() will be displayed with <code>std::fmt::Debug</code>.</p>
<pre><pre class="playpen"><code class="language-rust">use std::error::Error;
use std::result::Result;
fn do_some_io() -&gt; Result&lt;(), Box&lt;Error&gt;&gt; {

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<div id="content" class="content">
<main>
<pre><pre class="playpen"><code class="language-rust">use crate::chainerror::*;
<a class="header" href="#simple-chained-string-errors" id="simple-chained-string-errors"><h1>Simple Chained String Errors</h1></a>
<p>Now with the help of the <code>chainerror</code> crate, we can have a nicer output.</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::*;
use std::error::Error;
use std::result::Result;