#![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.pad("Foo")
    }
}
fn main() {
    assert_eq!(format!("{Foo:<4}"), "Foo ");
    assert_eq!(format!("{Foo:0>4}"), "0Foo");
}