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<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>matches</a>::<wbr><a class="macro" href=''>assert_matches</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class="rust macro">
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<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">assert_matches</span> {
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(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">expression</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">pattern</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=></span> { ... };
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}</pre>
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<div class='docblock'><p>Assert that an expression matches a refutable pattern.</p>
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<p>Syntax: <code>assert_matches!(</code> <em>expression</em> <code>,</code> <em>pattern</em> <code>)</code></p>
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<p>Panic with a message that shows the expression if it does not match the
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pattern.</p>
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">matches</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
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<span class="macro">assert_matches</span><span class="macro">!</span>(<span class="ident">data</span>.<span class="ident">get</span>(<span class="number">1</span>), <span class="prelude-val">Some</span>(_));
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