#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::net::Ipv6Addr;
fn main() {
    let addr = Ipv6Addr::new(
        0x1020,
        0x3040,
        0x5060,
        0x7080,
        0x90A0,
        0xB0C0,
        0xD0E0,
        0xF00D,
    );
    let addr_bits = addr.to_bits() & 0xffffffffffffffffffffffffffff0000_u128;
    assert_eq!(
        Ipv6Addr::new(0x1020, 0x3040, 0x5060, 0x7080, 0x90A0, 0xB0C0, 0xD0E0, 0x0000,),
        Ipv6Addr::from_bits(addr_bits)
    );
}