l">&lt;</span><span class="identifier">C</span><span class="special">,</span> <span class="identifier">_a</span><span class="special">&gt;</span> <span class="identifier">a</span><span class="special">;</span>
<span class="identifier">f</span><span class="special">(</span><span class="identifier">any</span><span class="special">&lt;</span><span class="identifier">C</span><span class="special">,</span> <span class="identifier">_a</span><span class="special">&gt;</span><span class="special">(</span><span clas