{"ast_node_type":"other","tokens":[{"end":80,"kind":"keyword","start":0,"text":"CoroutineKind::Async"}]}
            CoroutineKind::Async { .. } => (sym::Output, hir::LangItem::Future),
        let (assoc_ty_name, trait_lang_item) = match coro {
            CoroutineKind::Gen { .. } => (sym::Item, hir::LangItem::Iterator),