pan class='ident'>x</span> <span class='op'>=</span> <span class='number'>5</span>;
<span class='kw'>let</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>

<!-- `y` is an immutable binding to a mutable reference, which means that you can’t -->

<!-- bind `y` to something else (`y = &mut z`), but you can mutate the thing that’s -->

<!-- bound to `y` (`*y = 5`). A subtle distinction. -->

<p><code