ftmost binding of <code class="code">a</code> in list <code class="code">l</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Not_found</code> if there is no value associated with <code class="code">a</code> in the
   list <code class="code">l</code>.</li>
</ul>
</div>

<pre id="VALassoc_opt">val assoc_opt : 'a -&gt; ('a * 'b) list -&gt; 'b option</pre><div class="info ">
<div class="info-desc">
<p><code class="code">assoc_opt&nbsp;a&nbsp;l</code> returns the value associated with key <