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