</code></a> as a parameter:</p>

<pre class="rust rust-example-rendered">
<span class="kw">fn</span> <span class="ident">call_with_one</span><span class="op">&lt;</span><span class="ident">F</span><span class="op">&gt;</span>(<span class="ident">func</span>: <span class="ident">F</span>) <span class="op">-&gt;</span> <span class="ident">usize</span>
    <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">Fn</span>(<span class="ident">usize</span>) <span class="op">-&gt;</span> <s