e</span> <span class="identifier">sink</span><span class="special">(</span>
    <span class="special">[&amp;](</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">coroutines</span><span class="special">::</span><span class="identifier">asymmetric_coroutine</span><span class="special">&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">tuple</span><span class="special">&lt;</span><span class="keyword">int</span