Macro log::warn [] [src]

macro_rules! warn {
    ($($arg:tt)*) => { ... };
}
🔬 This is a nightly-only experimental API. (rustc_private)

use the crates.io log library instead

A convenience macro for logging at the warning log level.

Examples

#[macro_use] extern crate log;

fn main() {
    let code = 3;
    warn!("you may like to know that a process exited with: {}", code);
}Run

Assumes the binary is main:

$ RUST_LOG=warn ./main
WARN:main: you may like to know that a process exited with: 3