{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"assert_eq!(\"-1_234.5678e10\","}]}
    assert_eq!("-1_234.5678e10", format_with_underscores("-1234.5678e10".to_string()));
    assert_eq!("12_345.67e14", format_with_underscores("12345.67e14".to_string()));
    assert_eq!("------", format_with_underscores("------".to_string()));