class='comment'>// Must use &#39;b here because this reference is</span>
            <span class='comment'>// being passed to that scope.</span>
            <span class='kw'>let</span> <span class='ident'>y</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;b</span> <span class='ident'>i32</span> <span class='op'>=</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;b</span> <span class='ident'>x</span>;
            <span class='ident'>z</span> <span class='op'>=</span> <span c