// Wrong suffix to avoid compile directed
    for i in 0..std::env::args()
        .nth(1)
        .and_then(|s| s.parse::<usize>().ok())
        .unwrap_or(10)
    {
        error!("booting up, error {}", i);
        warn!("booting up, warn  {}", i);
        info!("booting up, info  {}", i);
        debug!("booting up, debug {}", i);
        trace!("booting up, trace {}", i);
    }