vars.addAll(((ArbitraryLengthPathNode) node).getMaybeProducedBindings());
vars.addAll(((ArbitraryLengthPathNode) node).getMaybeProducedBindings());
varSet.addAll(((ArbitraryLengthPathNode) op).getMaybeProducedBindings());
varSet.addAll(((ArbitraryLengthPathNode) op).getMaybeProducedBindings());