ype-t">t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span><span>(<a href="index.html#type-t">t</a> * <a href="index.html#type-t">t</a>)</span> option</span></code></dt><dt class="spec value" id="val-filter_mul"><a href="#val-filter_mul" class="anchor"></a><code><span class="keyword">val</span> filter_mul : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;