eprint in std - Rust (original) (raw)

Macro eprint

1.19.0 · Source

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

Expand description

Prints to the standard error.

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

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

See the formatting documentation in std::fmtfor details of the macro argument syntax.

§Panics

Panics if writing to io::stderr fails.

Writing to non-blocking stderr can cause an error, which will lead this macro to panic.

§Examples

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