{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":".chain(itertools::izip!(fields.iter().rev(),"}]}
            .chain(itertools::izip!(fields.iter().rev(), unwind_ladder, dropline_ladder).map(
        iter::once(succ)
                |(&(place, path), &unwind_succ, &dropline_to)| {