#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(int_format_into)]
use core::fmt::NumBuffer;
fn main() {
    let n = 0i128;
    let mut buf = NumBuffer::new();
    assert_eq!(n.format_into(& mut buf), "0");
    let n1 = i128::MIN;
    assert_eq!(n1.format_into(& mut buf), i128::MIN.to_string());
    let n2 = i128::MAX;
    assert_eq!(n2.format_into(& mut buf), i128::MAX.to_string());
}