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<h1 class="title">Attributes</h1>
<p><small>There is a new edition of the book and this is an old link.</small></p>
<blockquote>
<p>Any item declaration may have an attribute applied to it.</p>
</blockquote>
<pre class="rust rust-example-rendered">
<span class="comment">// A function marked as a unit test</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_foo</span>() {
<span class="comment">/* ... */</span>
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0A%2F%2F%20A%20function%20marked%20as%20a%20unit%20test%0A%23%5Btest%5D%0Afn%20test_foo()%20%7B%0A%20%20%20%20%2F*%20...%20*%2F%0A%7D%0A%7D">Run</a></pre>
<hr />
<p>Here are the relevant sections in the new and old books:</p>
<ul>
<li><strong><a href="../reference/attributes.html">In the Rust Reference: Ch 5.3 — Attributes</a></strong></li>
<li><small><a href="first-edition/attributes.html">In the first edition: Ch 3.27 — Attributes</a></small></li>
</ul>
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