{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"hir::CoroutineDesugaring::AsyncGen"}]}
                            hir::CoroutineDesugaring::AsyncGen => LangItem::AsyncIterator,
                            hir::CoroutineDesugaring::Async => LangItem::Future,
                            hir::CoroutineDesugaring::Gen => LangItem::Iterator,