pan> <span class="keyword">const</span><span class="special">&amp;</span>
      <span class="special">,</span> <span class="identifier">phoenix</span><span class="special">::</span><span class="identifier">result_of</span><span class="special">::</span><span class="identifier">context</span><span class="special">&lt;</span><span class="keyword">int</span><span class="special">,</span> <span class="identifier">invert_actions</span><span class="special">&gt;::</span><span class="identifier">type</span>
    <s