{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"assert_eq!(\"------\","}]}
    assert_eq!("------", format_with_underscores("------".to_string()));
    assert_eq!("-1_234.5678e10", format_with_underscores("-1234.5678e10".to_string()));
    assert_eq!("abcdefgh", format_with_underscores("abcdefgh".to_string()));