</code>.  Not tail-recursive.<br>
</div>
<br>
<span id="6_Iteratorsontwolists"><h6>Iterators on two lists</h6></span><br>
<pre><span id="VALiter2"><span class="keyword">val</span> iter2</span> : <code class="type">('a -&gt; 'b -&gt; unit) -&gt; 'a list -&gt; 'b list -&gt; unit</code></pre><div class="info">
<code class="code"><span class="constructor">List</span>.iter2 f [a1; ...; an] [b1; ...; bn]</code> calls in turn
   <code class="code">f a1 b1; ...; f an bn</code>.
   Raise <code class="code"><span cla