{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"TyKind::Raw(mt,"}]}
            TyKind::Raw(mt, ty) => (false, mt, ty),
            TyKind::Ref(mt, _, ty) => (true, mt, ty),
            _ => return self.unify_and(&from_ty, to_ty, identity),