log::error!

macro_rules! error {
    ($($arg:tt)*) => (log!(::log::ERROR, $($arg)*))
}

A convenience macro for logging at the error log level.

Example

#[macro_use] extern crate log;

fn main() {
    let error = 3u;
    error!("the build has failed with error code: {}", error);
}

Assumes the binary is main:

$ RUST_LOG=error ./main
ERROR:main: the build has failed with error code: 3