Macro std::eprintln1.19.0 [] [src]

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

Macro for printing 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 if writing to io::stderr fails.


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