module main

pub struct MyError implements IError {
pub:
	msg    string
	code   int
	domain int
	level  int
}

pub fn (e MyError) str() string {
	return '${e.msg} ${e.code}:${e.domain}:${e.level}'
}

pub fn (e MyError) msg() string {
	return e.msg
}

pub fn (e MyError) code() int {
	return e.code
}

fn MyError.new(msg string, code int, domain int, level int) MyError {
	return MyError{
		msg:    msg
		code:   code
		domain: domain
		level:  level
	}
}

fn foo() ! {
	return MyError.new('xxx', 1, 1, 1)
}

fn main() {
	foo() or {
		if err is MyError {
			eprintln(err)
		}
	}
}