></span> <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-t">t</a></span></code></div></div><div class="odoc-spec"><div class="spec module" id="module-Op" class="anchored"><a href="#module-Op" class="anchor"></a><code><span><span class="keyword">module</span> <a href="Op/index.html">Op</a></span><span> : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-reduce" class="a