#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::fmt::{self, Alignment};
struct Foo;
impl fmt::Display for Foo {
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        let s = if let Some(s) = formatter.align() {
            match s {
                Alignment::Left => "left",
                Alignment::Right => "right",
                Alignment::Center => "center",
            }
        } else {
            "into the void"
        };
        write!(formatter, "{s}")
    }
}
fn main() {
    assert_eq!(format!("{Foo:<}"), "left");
    assert_eq!(format!("{Foo:>}"), "right");
    assert_eq!(format!("{Foo:^}"), "center");
    assert_eq!(format!("{Foo}"), "into the void");
}