{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"[]"}]}
            [] layout: rustc_abi::LayoutData<rustc_abi::FieldIdx, rustc_abi::VariantIdx>,
        $macro!([
            [] proxy_coroutine_layout: rustc_middle::mir::CoroutineLayout<'tcx>,