="val-mon_decr"><a href="#val-mon_decr" class="anchor"></a><code><span class="keyword">val</span> mon_decr : <span>(<span>(<span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span>)</span> * <span>(<span class="type-var">'c</span> <span>&#45;&gt;</span> <span class="type-var">'d</span>)</span>)</span> <span>&#45;&gt;</span> <span>(<span>(<span class="type-var">'e</span> * <span class="type-var">'c</span>)</span> * <span>(<span class="type-var">'f</span> * <span class="type-var