{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"assert_eq!(t,"}]}
        assert_eq!(t, t2); // we are misusing TypeRelation here; both LHS and RHS ought to be ==
    fn tys(&mut self, t: Ty<'tcx>, t2: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {