{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"self.add_constraints_from_region(current,"}]}
                self.add_constraints_from_region(current, region, variance);
            ty::Ref(region, ty, mutbl) => {
                self.add_constraints_from_mt(current, &ty::TypeAndMut { ty, mutbl }, variance);