<span><span class="type-var">'b</span> list</span> <span>&#45;&gt;</span> <span><span class="type-var">'c</span> list</span> <span>&#45;&gt;</span> <span class="type-var">'a</span></code></dt><dt class="spec value" id="val-fold_right2"><a href="#val-fold_right2" class="anchor"></a><code><span class="keyword">val</span> fold_right2 : <span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span> <span>&#45;&gt;</span> <span class="type-var">'c</span> <span>&#45;&gt;</span> <s