{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"Rvalue::NullaryOp(NullOp::ContractChecks,"}]}
            Rvalue::NullaryOp(NullOp::ContractChecks, _)
            }
            | Rvalue::NullaryOp(NullOp::UbChecks, _) => Ok(Ty::bool_ty()),