pan class="parameter-name">callback</span>(<span class="parameter" id="callback-param-arg"><span class="type-annotation">T</span> <span class="parameter-name">arg</span></span>)</span>)
      
    </section>
    <section class="desc markdown">
      <p>Registers the given callback in this zone.</p>
<p>Similar to <a href="dart-async/Zone/registerCallback.html">registerCallback</a> but with a unary callback.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implemen