<span><span>(<span class="type-var">'a</span> * <span class="type-var">'b</span>)</span> <span class="xref-unresolved">Base__Option</span>.t</span></span></code></div></div><div class="odoc-spec"><div class="spec module anchored" id="module-Open_on_rhs"><a href="#module-Open_on_rhs" class="anchor"></a><code><span><span class="keyword">module</span> <a href="Open_on_rhs/index.html">Open_on_rhs</a></span><span> : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div></div></