gt; 'b -&gt; 'c -&gt; 'c) -&gt; 'a list -&gt; 'b list -&gt; 'c -&gt; 'c</pre><div class="info ">
<div class="info-desc">
<p><code class="code">fold_right2&nbsp;f&nbsp;[a1;&nbsp;...;&nbsp;an]&nbsp;[b1;&nbsp;...;&nbsp;bn]&nbsp;init</code> is
   <code class="code">f&nbsp;a1&nbsp;b1&nbsp;(f&nbsp;a2&nbsp;b2&nbsp;(...&nbsp;(f&nbsp;an&nbsp;bn&nbsp;init)&nbsp;...))</code>.</p>
</div>
<ul class="info-attributes">
<li><b>Raises</b> <code>Invalid_argument</code> if the two lists are determined
   to have different len