{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"assert_eq!(a,"}]}
        assert_eq!(a, b); // we are misusing TypeRelation here; both LHS and RHS ought to be ==
    fn tys(&mut self, a: Ty<'tcx>, b: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {
        relate::structurally_relate_tys(self, a, b)