 <span class="identifier">remove_reference</span><span class="special">&lt;</span> <span class="identifier">First</span> <span class="special">&gt;</span><span class="special">::</span>type <span class="special">&gt;</span><span class="special">::</span>type<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">remove_const</span><span class="special">&lt;</span> <span class="keyword">typename</span> <span class="identifier">remove_reference</span><span class="special"