</code></dt><dt class="spec value" id="val-coerce_fn"><a href="#val-coerce_fn" class="anchor"></a><code><span class="keyword">val</span> coerce_fn : <span><span class="type-var">'a</span> <a href="index.html#type-fn">fn</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'b</span> <a href="index.html#type-fn">fn</a></span> <span>&#45;&gt;</span> <span class="type-var">'a</span> <span>&#45;&gt;</span> <span class="type-var">'b</span></code></dt></dl><div class="spec module-type" id="module-type-FO