                   <code class="computeroutput"><span class="identifier">Lookup</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      The symbol search implementation
                    </p>
                  </td>
<td>
                    <p>
                      if T is <code class="computeroutput"><span class="identifier">unused_type</span></code>,
                      <code class="computeroutput"><span class="identifier">std</span><span clas