{"ast_node_type":"other","tokens":[{"end":38,"kind":"keyword","start":0,"text":")"}]}
    ) -> Result<(), ErrorGuaranteed> {
        f: impl Fn(TraitItemId) -> Result<(), ErrorGuaranteed> + DynSend + DynSync,
        try_par_for_each_in(&self.trait_items[..], |&&id| f(id))