: 'a -&gt; 'a list -&gt; bool</pre><div class="info ">
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<p><code class="code">mem&nbsp;a&nbsp;set</code> is true if and only if <code class="code">a</code> is equal
   to an element of <code class="code">set</code>.</p>
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<pre id="VALmemq">val memq : 'a -&gt; 'a list -&gt; bool</pre><div class="info ">
<div class="info-desc">
<p>Same as <a href="List.html#VALmem"><code class="code">List.mem</code></a>, but uses physical equality instead of structural
   equality to compar