{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":".chain(args.iter().map(|it|"}]}
            .chain(args.iter().map(|it| Ok(it.get(self)?.to_owned())))
        let arg_bytes = iter::once(Ok(closure_data))
            .collect::<Result<Vec<_>>>()?;