> <span>&#45;&gt;</span> <span class="type-var">'c</span>)</span></span> <span>&#45;&gt;</span> <span><span class="type-var">'c</span> <a href="index.html#type-t">t</a></span></code></dt><dt class="spec value" id="val-rev_map2"><a href="#val-rev_map2" class="anchor"></a><code><span class="keyword">val</span> rev_map2 : <span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> <a href="index.html#type-t">t</a></span> <span>&#