><span class="identifier">hold</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      Create a new attribute instance while parsing <code class="computeroutput"><span class="identifier">a</span></code>, copying the result to
                      the outer attribute only after <code class="computeroutput"><span class="identifier">a</span></code>
            