eyword">module</span> <a href="Fold/index.html">Fold</a> : <span class="keyword">functor</span> (<a href="Fold/argument-1-F/index.html">F</a> : <a href="index.html#module-type-FOLD_MAP">FOLD_MAP</a>) <span>&#45;&gt;</span> <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div><div class="spec module-type" id="module-type-TRAVERSE"><a href="#module-type-TRAVERSE" class="anchor"></a><code><span class="keyword">module</span> <span class="keyword">type</span> <a href="module-type-TRA