{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"helper_attrs:"}]}
    helper_attrs: FxHashMap<LocalExpnId, Vec<(Ident, NameBinding<'ra>)>>,
    /// Helper attributes that are in scope for the given expansion.
    /// Ready or in-progress results of resolving paths inside the `#[derive(...)]` attribute