ass="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">Compare</span><span class="special">,</span> <span class="identifier">Combine</span><span class="special">,</span> <span class="identifier">Section</span><span class="special">,</span> <span class="identifier">Alloc</span> <span class="special">&gt;</span> <span class="special">&amp;</span> 
    <a class="link" href="map.html#idp41763872-bb"><span class="identifier">_subtract</span></a><span 