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    use {Poll, Async, Future, AsyncSink};
    use sink::Sink;

    /// Future for the `Sink::send` combinator, which sends a value to a sink and
    /// then waits until the sink has fully flushed.
    #[derive(Debug)]
    #[must_use = "futures do nothing unless polled"]
    pub struct Send<S: Sink> {
        sink: Option<S>,
        item: Option<S::SinkItem>,
    }

    pub fn new<S: Sink>(sink: S, item: S::SinkItem) -> Send<S> {
        Send {
            sink: Some(sink),
            item: Some(item),
        }
    }

    impl<S: Sink> Send<S> {
        /// Get a shared reference to the inner sink.
        pub fn get_ref(&self) -> &S {
            self.sink.as_ref().take().expect("Attempted Send::get_ref after completion")
        }

        /// Get a mutable reference to the inner sink.
        pub fn get_mut(&mut self) -> &mut S {
            self.sink.as_mut().take().expect("Attempted Send::get_mut after completion")
        }

        fn sink_mut(&mut self) -> &mut S {
            self.sink.as_mut().take().expect("Attempted to poll Send after completion")
        }

        fn take_sink(&mut self) -> S {
            self.sink.take().expect("Attempted to poll Send after completion")
        }
    }

    impl<S: Sink> Future for Send<S> {
        type Item = S;
        type Error = S::SinkError;

        fn poll(&mut self) -> Poll<S, S::SinkError> {
            if let Some(item) = self.item.take() {
                if let AsyncSink::NotReady(item) = self.sink_mut().start_send(item)? {
                    self.item = Some(item);
                    return Ok(Async::NotReady);
                }
            }

            // we're done sending the item, but want to block on flushing the
            // sink
            try_ready!(self.sink_mut().poll_complete());

            // now everything's emptied, so return the sink for further use
            Ok(Async::Ready(self.take_sink()))
        }
    }

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