Can't bind udp socket to link-local address

[misuzu]

This code panics:

extern crate mio;

use std::net::{SocketAddr, SocketAddrV6};

use mio::Ipv6Addr;
use mio::udp::UdpSocket;

fn main() {
    let socket = UdpSocket::v6().unwrap();
    socket.bind(&SocketAddr::V6(SocketAddrV6::new(Ipv6Addr::new(0xfe80, 0, 0, 0, 0xbe5f, 0xf4ff, 0xfee9, 0x35df), 0xfc00, 0, 2))).unwrap();
}

thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: Error { repr: Os { code: 99, message: "Cannot assign requested address" } }', ../src/libcore/result.rs:746
stack backtrace:
   1:     0x55dd2f317cc0 - sys::backtrace::tracing::imp::write::h3bbb320d569781f92cv
   2:     0x55dd2f319e1f - panicking::default_handler::_$u7b$$u7b$closure$u7d$$u7d$::closure.44520
   3:     0x55dd2f319a98 - panicking::default_handler::hf1209fec3f963ae7H0z
   4:     0x55dd2f313e8c - sys_common::unwind::begin_unwind_inner::h2ff9ae045f111c6dg2t
   5:     0x55dd2f314518 - sys_common::unwind::begin_unwind_fmt::hf803f209d02109a7m1t
   6:     0x55dd2f317271 - rust_begin_unwind
   7:     0x55dd2f34ecbf - panicking::panic_fmt::hd76b622b6f659cc5FRL
   8:     0x55dd2f30f8cb - result::unwrap_failed::h7652535341612392168
                        at ../src/libcore/macros.rs:29
   9:     0x55dd2f30fc14 - result::Result<T, E>::unwrap::h4570724438596938202
                        at ../src/libcore/result.rs:687
  10:     0x55dd2f30f529 - main::h1076113ec20c8e6fkaa
                        at src/main.rs:50
  11:     0x55dd2f3196f4 - sys_common::unwind::try::try_fn::h12478214143095739015
  12:     0x55dd2f3171fb - __rust_try
  13:     0x55dd2f31918b - rt::lang_start::h4f110050dd8fc253NSz
  14:     0x55dd2f30fd19 - main
  15:     0x7f692343086f - __libc_start_main
  16:     0x55dd2f30f328 - _start
  17:                0x0 - <unknown>

Same on python is just fine:

Python 2.7.11+ (default, Feb 22 2016, 16:38:42)
[GCC 5.3.1 20160220] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket
>>>
>>> s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
>>> s.bind(('fe80::be5f:f4ff:fee9:35df', 0xfc00, 0, 2))
>>>

Using mio from git.

[rrichardson]

This can be solved with a migration to Rust's net types, e.g. :
https://doc.rust-lang.org/nightly/std/net/struct.SocketAddrV6.html

[alexcrichton]

I believe the migration has now been done, @misuzu does the master branch of mio work for you?

[carllerche]

Closing for now. If the issue is not resolved, please open a new issue & reference this one. Thanks.