{"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"option_env!(\"CFG_DISABLE_UNSTABLE_FEATURES\").is_some_and(|s|"}]}
            option_env!("CFG_DISABLE_UNSTABLE_FEATURES").is_some_and(|s| s != "0");
        let disable_unstable_features =
        // Returns whether `krate` should be counted as unstable