Ipv4Addr::is_global() returns true for non global address

[JakubOnderka]

This code should be correct, because according to IANA IPv4 Special-Purpose Address Registry document, all address in 0.0.0.0/8 are not global reachable.

#![feature(ip)]
use std::net::Ipv4Addr;

fn main() {
    let ip = Ipv4Addr::new(0, 0, 0, 1);
    assert!(!ip.is_global());
}

But it panic on assertion failed in latest nightly (2019-01-11) (see Rust Playground)

[frewsxcv]

Relevant thread: #27709

[JakubOnderka]

@JakubOnderka please post a proper link to the playground by clicking on "share" in the upper right corner and copying that link it gives you.

Sorry, fixed