#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(never_type)]
use std::fmt;
trait Debug {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result;
}
impl Debug for ! {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        *self
    }
}
fn main() {}