ty is <code>null</code>, or if it is not the correct termination
capability of the isolate identified by <a href="dart-isolate/Isolate/controlPort.html">controlPort</a>,
then calls to those methods will have no effect.</p>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>Implementation</span> </h2>
          <pre class="language-dart"><code class="language-dart">final Capability terminateCapability

</code></pre>
        </section>

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