ass='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> { <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>&quot;u8: {}&quot;</span>, <span class='op'>*</span><span class='self'>self</span>) }
}

<span class='kw'>impl</span> <span class='ident'>Foo</span> <span class='kw'>for</span> <span class='ident'>String</span> {
    <span class='kw'>fn</span> <span class='ident'>method</span>(<span class='kw-2'>&amp;</span