{"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
    let e: ExpandResult<Arc<[SyntaxError]>> =
) -> Option<Arc<ExpandResult<Arc<[SyntaxError]>>>> {
        db.parse_macro_expansion(macro_call_id).map(|it| Arc::from(it.0.errors()));