ed events are
still pending delivery, if the subscription is paused,
or if the subscription isn't listening yet.
If it's necessary to know whether the "done" event has been delievered,
<a href="dart-async/StreamController/done.html">done</a> future will complete when that has happened.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">void closeSync();</code></pre>
    </sectio