{"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"FnTrait::AsyncFnMut"}]}
            FnTrait::AsyncFnMut => LangItem::AsyncFnMut,
            FnTrait::AsyncFnOnce => LangItem::AsyncFnOnce,
            FnTrait::AsyncFn => LangItem::AsyncFn,