an class="keyword">functor</span> (<a href="Map_Accum/argument-2-T/index.html">T</a> : <a href="../../../Interface/index.html#module-type-TRAVERSABLE_F">Interface.TRAVERSABLE_F</a>) <span>&#45;&gt;</span> <span class="keyword">sig</span> ... <span class="keyword">end</span></code></div></div></body></html>