 that takes an element of the sequence as
  its argument and returns <code>true</code> if the element should be included or
  <code>false</code> otherwise. Once <code>predicate</code> returns <code>false</code> it will not be
  called again.</p>

    <h4>Declaration</h4>    
    <code class="language-swift">func prefix(while predicate: @escaping (LazyFilterSequence&lt;Base&gt;.Elements.Iterator.Element) -&gt; Bool) -&gt; LazyPrefixWhileSequence&lt;LazyFilterSequence&lt;Base&gt;.Elements&gt;</code>
    
    