#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::net::Ipv4Addr;
fn main() {
    assert_eq!(Ipv4Addr::new(0, 0, 0, 0).is_unspecified(), true);
    assert_eq!(Ipv4Addr::new(45, 22, 13, 197).is_unspecified(), false);
}