{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"let"}]}
        let predicates = self.with_shifted_in(DebruijnIndex::ONE, |ctx| {
        let self_ty = TyKind::BoundVar(BoundVar::new(DebruijnIndex::INNERMOST, 0)).intern(Interner);
            let mut predicates = Vec::new();