{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"idx_sorted_by_item_key.sort_by_key(|&idx|"}]}
        idx_sorted_by_item_key.sort_by_key(|&idx| &items[idx].0);
        // `sort_by_key` is stable, so insertion order is preserved for duplicate items.