{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"//"}]}
                // drop the coroutine-closure's upvars.
                // the future returned by `<[coroutine-closure] as AsyncFnOnce>::call_once` will
                let body = if id_args.as_coroutine().kind_ty() == args.as_coroutine().kind_ty() {