{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"unused_macros:"}]}
    unused_macros: FxIndexMap<LocalDefId, (NodeId, Ident)>,
    ast_transform_scopes: FxHashMap<LocalExpnId, Module<'ra>>,
    /// A map from the macro to all its potentially unused arms.