-tree vn_binary_op_lookup (tree);
-void vn_binary_op_insert (tree, tree);
-tree vn_unary_op_lookup (tree);
-void vn_unary_op_insert (tree, tree);
-tree vn_reference_lookup (tree, VEC (tree, gc) *);
+tree vn_nary_op_lookup (tree);
+void vn_nary_op_insert (tree, tree);
+tree vn_reference_lookup (tree, VEC (tree, gc) *, bool);