nfo ">
<div class="info-desc">
<p><code class="code">mem&nbsp;a&nbsp;l</code> is true if and only if <code class="code">a</code> is equal
   to an element of <code class="code">l</code>.</p>
</div>
</div>

<pre><span id="VALmemq"><span class="keyword">val</span> memq</span> : <code class="type">'a -&gt; set:'a list -&gt; bool</code></pre><div class="info ">
<div class="info-desc">
<p>Same as <a href="List.html#VALmem"><code class="code"><span class="constructor">List</span>.mem</code></a>, but uses physical