class='macro'>!</span>(<span class='string'>&quot;{}&quot;</span>, <span class='ident'>data</span>);
        <span class='kw'>return</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>s</span>
    }
}

<span class='kw'>fn</span> <span class='ident'>main</span>() {
    <span class='lifetime'>&#39;c</span>: {
        <span class='kw'>let</span> <span class='ident'>x</span>: <span class='ident'>u32</span> <span class='op'>=</span> <span class='number'>0</span>;
     