ut x: i32) {
}
}</span><pre class='rust rust-example-rendered'>
<span class='kw'>let</span> (<span class='kw-2'>mut</span> <span class='ident'>x</span>, <span class='ident'>y</span>) <span class='op'>=</span> (<span class='number'>5</span>, <span class='number'>6</span>);

<span class='kw'>fn</span> <span class='ident'>foo</span>(<span class='kw-2'>mut</span> <span class='ident'>x</span>: <span class='ident'>i32</span>) {</pre>

<!-- # Interior vs. Exterior Mutability -->

<h1 id='内側-vs-外側のミュ�