{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"StabilityLevel::Unstable"}]}
            StabilityLevel::Unstable { old_name, .. } => FeatureStability::Unstable { old_name },
        let feature_stability = match level {
            StabilityLevel::Stable { since, .. } => FeatureStability::AcceptedSince(match since {