Async<TcpListener>::accept removes interest on drop, and no poll_* based alternative

[Darksonn]

The source of async-std has the following snippet:

impl<'a> Stream for Incoming<'a> {
    type Item = io::Result<TcpStream>;

    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        let future = self.0.accept();
        pin_utils::pin_mut!(future);

        let (socket, _) = futures_core::ready!(future.poll(cx))?;
        Poll::Ready(Some(Ok(socket)))
    }
}

link

In the latest release of async-io, the accept future was changed to release interest when the future is dropped, which breaks the above implementation. And as far as I can see, there's no poll_* based alternative for waiting for read-readiness on the Async type.

Originally reported to async-std as async-rs/async-std#888

[ghost]

Thanks for the report! Fixed by async-rs/async-std#889