impl_stable_hash_for!(struct ty::ClosureSubsts<'tcx> { substs });
-impl_stable_hash_for!(tuple_struct ty::GeneratorInterior<'tcx> { ty });
+impl_stable_hash_for!(struct ty::GeneratorInterior<'tcx> { witness });
impl_stable_hash_for!(struct ty::GenericPredicates<'tcx> {
parent,