span>) <span>&#45;&gt;</span> <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><div class="spec module" id="module-Monad"><a href="#module-Monad" class="anchor"></a><code><span class="keyword">module</span> <a href="Monad/index.html">Monad</a> : <span class="keyword">functor</span> (<a href="Monad/argument-1-M/index.html">M</a> : <a href="../../../Bastet/Interface/index.html#module-type-MONAD">Bastet.Interface.MONAD</a>) <span>&#45;&gt;</span> <span class="keyword">functor</