Failling assertion in oneshot abort_selection with native threads.

The exact assert I am seeing fail is:

task '<unnamed>' failed at 'assertion failed: self.data.is_none()', /build/buildd/rust-nightly-201403090405~e1681df~precise/src/libstd/comm/oneshot.rs:346

If a task waits on a select and one of the channels is new (still in OneShot mode), and that channel is sent two messages before the other task is scheduled. This assertion will be triggered.

Code to reproduce:

extern crate native;

use std::io::timer::Timer;
use std::comm::{Chan, Select};

#[start]
fn start(argc: int, argv: **u8) -> int {
    native::start(argc, argv, main)
}

fn select_task(p: &Port<()>)
{
    let mut timer = Timer::new().unwrap();

    timer.sleep(25);

    let select = Select::new();
    let mut handle = select.handle(p);
    unsafe {handle.add()};

    let _ = select.wait();
    return;
}

fn main()
{
    let mut timer = Timer::new().unwrap();

    let (p, c) = Chan::new();
    spawn(proc() {
        select_task(&p)
    });

    timer.sleep(50);
    c.send(());
    c.send(());
}

[sfackler]

cc @alexcrichton

[alexcrichton]

Thanks for the small test case to reproduce!