cates" class="anchor"></a><code><span><span class="keyword">val</span> subst_of_list_duplicates : <span><span><span>(<a href="../../IR/Ident/index.html#type-t">IR.Ident.t</a> * <a href="../../IR/Exp/index.html#type-t">IR.Exp.t</a>)</span> list</span> <span class="arrow">&#45;&gt;</span></span> <a href="#type-subst">subst</a></span></code></div><div class="spec-doc"><p>like subst_of_list, but allow duplicate ids and only keep the first occurrence</p></div></div><div class="odoc-spec"><div class="spec value" 