{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"(unstable,"}]}
    (unstable, cfg_contract_checks, "1.86.0", Some(128044)),
    /// Allows the use of `#[cfg(contract_checks)` to check if contract checks are enabled.
    /// Allows the use of `#[cfg(overflow_checks)` to check if integer overflow behaviour.