28 lines
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28 lines
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Construct an ad-hoc error from a string or existing non-`anyhow` error value."><meta name="keywords" content="rust, rustlang, rust-lang, anyhow"><title>anyhow in anyhow - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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</a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">anyhow</a></h2><div id="sidebar-vars" data-name="anyhow" data-ty="macro" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../anyhow/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Macro <a href="index.html">anyhow</a>::<wbr><a class="macro" href="#">anyhow</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/anyhow/macros.rs.html#208-227" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><div class="example-wrap"><pre class="rust macro"><code><span class="macro">macro_rules!</span> <span class="ident">anyhow</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">msg</span> : <span class="ident">literal</span> $(,) <span class="question-mark">?</span>) => { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">err</span> : <span class="ident">expr</span> $(,) <span class="question-mark">?</span>) => { ... };
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">fmt</span> : <span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span> : <span class="ident">tt</span>) <span class="kw-2">*</span>) => { ... };
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}</code></pre></div>
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</div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Construct an ad-hoc error from a string or existing non-<code>anyhow</code> error
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value.</p>
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<p>This evaluates to an <a href="struct.Error.html" title="crate::Error"><code>Error</code></a>. It can take either just a
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string, or a format string with arguments. It also can take any custom type
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which implements <code>Debug</code> and <code>Display</code>.</p>
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<p>If called with a single argument whose type implements <code>std::error::Error</code>
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(in addition to <code>Debug</code> and <code>Display</code>, which are always required), then that
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Error impl’s <code>source</code> is preserved as the <code>source</code> of the resulting
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<code>anyhow::Error</code>.</p>
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<h2 id="example" class="section-header"><a href="#example">Example</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">anyhow</span>::{<span class="ident">anyhow</span>, <span class="prelude-ty">Result</span>};
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<span class="kw">fn</span> <span class="ident">lookup</span>(<span class="ident">key</span>: <span class="kw-2">&</span><span class="ident">str</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">V</span><span class="op">></span> {
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<span class="kw">if</span> <span class="ident">key</span>.<span class="ident">len</span>() <span class="op">!</span><span class="op">=</span> <span class="number">16</span> {
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<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="macro">anyhow!</span>(<span class="string">"key length must be 16 characters, got {:?}"</span>, <span class="ident">key</span>));
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}
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<span class="comment">// ...</span>
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}</code></pre></div>
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