{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"ty::ClosureKind::Fn"}]}
            ty::ClosureKind::Fn => lang_items.async_fn_trait(),
        match self.tcx.fn_trait_kind_from_def_id(def_id)? {
            ty::ClosureKind::FnMut => lang_items.async_fn_mut_trait(),