#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::fmt;
struct Foo(i32);
impl fmt::Display for Foo {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter.write_fmt(format_args!("Foo {}", self.0))
    }
}
fn main() {
    assert_eq!(format!("{}", Foo(- 1)), "Foo -1");
    assert_eq!(format!("{:0>8}", Foo(2)), "Foo 2");
}