assoc"><code class="code"><span class="constructor">List</span>.remove_assoc</code></a>, but uses physical equality instead
   of structural equality to compare keys.  Not tail-recursive.</p>
</div>
</div>
<h2 id="1_Listsofpairs">Lists of pairs</h2>
<pre><span id="VALsplit"><span class="keyword">val</span> split</span> : <code class="type">('a * 'b) list -&gt; 'a list * 'b list</code></pre><div class="info ">
<div class="info-desc">
<p>Transform a list of pairs into a pair of lists:
   <code class="code">sp