celable_interface">Cancelable</a></dd>
      </dl>
      <p>
        <p>An optional cancelable object that can be used to abort a long-running parse.</p>

        
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  <h5 class="returns">Returns</h5>
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    <div><a class="xref" href="sourcefile.html#grammarkdown_SourceFile_class">SourceFile</a></div>
    <p>
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  <h4 id="grammarkdown_CoreAsyncHost_readFile_member_1_" data-uid="gramma