use ebacktrace::define_error;
use std::fmt::{ self, Display, Formatter };

/// The error kind
#[derive(Debug, Copy, Clone)]
enum ErrorKind {
    MyErrorA,
    Testolope
}
impl Display for ErrorKind {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        write!(f, "{:#?}", self)
    }
}
// Define our custom error type
define_error!(Error);

/// A function that will always fail
fn will_fail() -> Result<(), Error<ErrorKind>> {
    Err(ErrorKind::Testolope)?
}

// Will panic with a nice error
if let Err(e) = will_fail() {
    eprintln!("Error: {:?}", e);
    panic!("Fatal error")
}