{"ast_node_type":"variable","tokens":[{"end":100,"kind":"keyword","start":0,"text":"let"}]}
        let self_ty = TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0)).intern(Interner);
        cov_mark::hit!(lower_rpit);
        let predicates = self.with_shifted_in(DebruijnIndex::ONE, |ctx| {