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<section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">fmt</span>::{<span class="self">self</span>, <span class="ident">Display</span>, <span class="ident">Debug</span>};
<span class="kw">use</span> <span class="ident">Fail</span>;
<span class="kw">use</span> <span class="ident">Error</span>;
<span class="doccomment">/// Constructs a `Fail` type from a string.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is a convenient way to turn a string into an error value that</span>
<span class="doccomment">/// can be passed around, if you do not want to create a new `Fail` type for</span>
<span class="doccomment">/// this use case.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">err_msg</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span>(<span class="ident">msg</span>: <span class="ident">D</span>) <span class="op">-></span> <span class="ident">Error</span> {
<span class="ident">Error</span>::<span class="ident">from</span>(<span class="ident">ErrorMessage</span> { <span class="ident">msg</span> })
}
<span class="doccomment">/// A `Fail` type that just contains an error message. You can construct</span>
<span class="doccomment">/// this from the `err_msg` function.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">struct</span> <span class="ident">ErrorMessage</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span> {
<span class="ident">msg</span>: <span class="ident">D</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span> <span class="ident">Fail</span> <span class="kw">for</span> <span class="ident">ErrorMessage</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> { }
<span class="kw">impl</span><span class="op"><</span><span class="ident">D</span>: <span class="ident">Display</span> <span class="op">+</span> <span class="ident">Debug</span> <span class="op">+</span> <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="lifetime">'static</span><span class="op">></span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">ErrorMessage</span><span class="op"><</span><span class="ident">D</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">Display</span>::<span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">msg</span>, <span class="ident">f</span>)
}
}
</pre>
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