{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"itertools::EitherOrBoth::Left(_)"}]}
                itertools::EitherOrBoth::Left(_) => {
                itertools::EitherOrBoth::Both(l, r) => (l, r),
                    unreachable!("mapping more input nodes than there are output nodes")