l) rethrows -&gt; Generator.Element?</code>
    
        <h4>Declared In</h4>
        <a href="../../protocol/SequenceType/"><code>SequenceType</code></a>    
</div></div>
</div>
<div class="declaration" id="func-next">
<a class="toggle-link" data-toggle="collapse" href="#comment-func-next">mutating func next()</a>
        
<div class="comment collapse" id="comment-func-next"><div class="p">
    <p>Advance to the next element and return it, or <code>nil</code> if no next
element exists.</p>

<p><strong>Requ