/span> <span class="special">...</span> <span class="identifier">Fns</span> <span class="special">&gt;</span>
<span class="keyword">typename</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">&lt;</span> <span class="identifier">Fn</span><span class="special">()</span> <span class="special">&gt;::</span><span class="identifier">type</span>
<span class="identifier">wait_first_success</span><span class="special">(</span> <spa