l</span></span></code></li><li id="type-category.ACundef" class="def variant constructor anchored"><a href="#type-category.ACundef" class="anchor"></a><code><span>| </span><span><span class="constructor">ACundef</span></span></code></li><li id="type-category.ACretval" class="def variant constructor anchored"><a href="#type-category.ACretval" class="anchor"></a><code><span>| </span><span><span class="constructor">ACretval</span></span></code></li><li id="type-category.ACobserver" class="def variant construct