{"ast_node_type":"variable","tokens":[{"end":89,"kind":"keyword","start":0,"text":"let"}]}
                    let tys = substs.iter(Interner).map(|ty| ty.assert_ty_ref(Interner));
                TyKind::Tuple(_, substs) => {
                    tys.cloned().map(|ty| (ty, PrivateUninhabitedField(false))).collect()