ode> if the two lists are determined
   to have different lengths.</p>
</div>
</div>

<pre><span id="VALfold_right2"><span class="keyword">val</span> fold_right2</span> : <code class="type">('a -&gt; 'b -&gt; 'c -&gt; 'c) -&gt; 'a list -&gt; 'b list -&gt; 'c -&gt; 'c</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">List</span>.fold_right2&nbsp;f&nbsp;[a1;&nbsp;...;&nbsp;an]&nbsp;[b1;&nbsp;...;&nbsp;bn]&nbsp;c</code> is
   <code class="code">f&nbsp;a1&nb