cess an element
that is not an instance of <code>R</code>, the access will throw instead.</p>
<p>When the returned iterable creates a new object that depends on
the type <code>R</code>, e.g., from <a href="dart-collection/IterableMixin/toList.html">toList</a>, it will have exactly the type <code>R</code>.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">Iterable&lt;R&gt; cast&