s="code">n</code>-th element of the given list.
    The first element (head of the list) is at position 0.
    Return <code class="code">None</code> if the list is too short.</p>
</div>
<ul class="info-attributes">
<li><b>Since</b> 4.05</li>
<li><b>Raises</b> <code>Invalid_argument</code> if <code class="code">n</code> is negative.</li>
</ul>
</div>

<pre id="VALrev">val rev : 'a list -&gt; 'a list</pre><div class="info ">
<div class="info-desc">
<p>List reversal.</p>
</div>
</div>

<pre id="VALinit">val in