log::error!

macro_rules! error {
    ($($arg:tt)*) => { ... };
}

Unstable (rustc_private)

: use the crates.io log library instead

A convenience macro for logging at the error log level.

Examples

#![feature(rustc_private)] #[macro_use] extern crate log; fn main() { let error = 3; error!("the build has failed with error code: {}", error); }

#[macro_use] extern crate log;

fn main() {
    let error = 3;
    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