{"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"StableSince::Version(v)"}]}
                StableSince::Version(v) => Symbol::intern(&v.to_string()),
            StabilityLevel::Stable { since, .. } => FeatureStability::AcceptedSince(match since {
                StableSince::Current => sym::env_CFG_RELEASE,