n class="keyword">sig</span> ... <span class="keyword">end</span></code></div><div class="spec module" id="module-B"><a href="#module-B" class="anchor"></a><code><span class="keyword">module </span><a href="B">B</a> : <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><div class="spec module" id="module-Base"><a href="#module-Base" class="anchor"></a><code><span class="keyword">module </span><a href="Base">Base</a> : <span class="keyword">sig</span> ... <span class="keyword">e