src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/codegen/AssignSymbols.java

@@ -801,11 +801,11 @@
         return new RuntimeNode(unaryNode, request, args);
     }
 
     @Override
     public Node leaveForNode(final ForNode forNode) {
-        if (forNode.isForIn()) {
+        if (forNode.isForIn() || forNode.isForOf()) {
             return forNode.setIterator(lc, newObjectInternal(ITERATOR_PREFIX)); //NASHORN-73
         }
 
         return end(forNode);
     }