ss="comment">// Metafunction allowing to get the type of any repository::distinct(...) </span>
    <span class="comment">// construct</span>
    <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Tail</span><span class="special">&gt;</span>
    <span class="keyword">struct</span> <span class="identifier">distinct_spec</span>
      <span class="special">:</span> <span class="identifier">spirit</span><span class="special">::</s