log::debug!

macro_rules! debug {
    (target: $target:expr, $($arg:tt)*) => (
        log!(target: $target, $crate::LogLevel::Debug, $($arg)*);
    );
    ($($arg:tt)*) => (
        log!($crate::LogLevel::Debug, $($arg)*);
    )
}

Logs a message at the debug level.

Logging at this level is disabled if any of the following cfgs are present: log_level = "off", log_level = "error", log_level = "warn", or log_level = "info".