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