{"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"opaque_ty_node_id,"}]}
            opaque_ty_node_id,
        let opaque_ty_ref = self.lower_opaque_inner(
            hir::OpaqueTyOrigin::AsyncFn { parent: fn_def_id, in_trait_or_impl },