d of structural
   equality to compare keys.</p>
</div>
</div>

<pre><span id="VALassq_opt"><span class="keyword">val</span> assq_opt</span> : <code class="type">'a -&gt; ('a * 'b) list -&gt; 'b option</code></pre><div class="info ">
<div class="info-desc">
<p>Same as <a href="List.html#VALassoc_opt"><code class="code"><span class="constructor">List</span>.assoc_opt</code></a>, but uses physical equality instead of structural
    equality to compare keys.</p>
</div>
<ul class="info-attributes">
<li><b>Since