// It effetively only contains upvars until the generator transformation runs.
// See librustc_body/transform/generator.rs for more details.
ty::Generator(def_id, substs, _) => {
- let tys : Vec<_> = substs.upvar_tys(def_id, self.tcx()).collect();
+ let tys : Vec<_> = substs.as_generator().upvar_tys(def_id, self.tcx()).collect();
self.open_drop_for_tuple(&tys)
}
ty::Tuple(..) => {