e class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='number'>5</span>;
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>y</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>x</span>;</pre>

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<p>今度�