Potential non-terminating loop in tokio_io::length_delimited::FramedWrite

[twittner]

tokio_io::length_delimited::FramedWrite::do_write does not handle Ok(Async::Ready(0)) specifically, which could be returned from AsyncWrite::write_buf, which calls AsyncWrite::poll_write, which in turn calls std::io::Write::write, whose documentation states: "A return value of 0 typically means that the underlying object is no longer able to accept bytes and will likely not be able to in the future as well [...]". Instead, the loop will continue and if Ok(Async::Ready(0)) is returned consistently, never terminate.