='ident'>Output</span><span class='op'>=</span><span class='ident'>T</span><span class='op'>&gt;</span> <span class='op'>+</span> <span class='ident'>Copy</span> {
    <span class='kw'>fn</span> <span class='ident'>area</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>T</span> {
        <span class='self'>self</span>.<span class='ident'>side</span> <span class='op'>*</span> <span class='self'>self</span>.<span class='ident'>side</span>
 