Macro std::eprintln

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

Prints to the standard error, with a newline.

Equivalent to the println! macro, except that output goes to io::stderr instead of io::stdout. See println! for example usage.

Use eprintln! only for error and progress messages. Use println! instead for the primary output of your program.

Panics

Panics if writing to io::stderr fails.

Examples

eprintln!("Error: Could not complete task");