epend</span>.map_tree&nbsp;<span class="constructor">String</span>.<span class="constructor">Map</span>.t<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;make_leaf&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Depend</span>.map_tree<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;make_node&nbsp;:&nbsp;<span class="constructor">Depend</span>.bound_map&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Depend</span>.map_tree<b