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    use {Async, Poll, IntoFuture, Future};
    use stream::Stream;

    /// A stream combinator which skips elements of a stream while a predicate
    /// holds.
    ///
    /// This structure is produced by the `Stream::skip_while` method.
    #[derive(Debug)]
    #[must_use = "streams do nothing unless polled"]
    pub struct SkipWhile<S, P, R> where S: Stream, R: IntoFuture {
        stream: S,
        pred: P,
        pending: Option<(R::Future, S::Item)>,
        done_skipping: bool,
    }

    pub fn new<S, P, R>(s: S, p: P) -> SkipWhile<S, P, R>
        where S: Stream,
              P: FnMut(&S::Item) -> R,
              R: IntoFuture<Item=bool, Error=S::Error>,
    {
        SkipWhile {
            stream: s,
            pred: p,
            pending: None,
            done_skipping: false,
        }
    }

    impl<S, P, R> SkipWhile<S, P, R> where S: Stream, R: IntoFuture {
        /// Acquires a reference to the underlying stream that this combinator is
        /// pulling from.
        pub fn get_ref(&self) -> &S {
            &self.stream
        }

        /// Acquires a mutable reference to the underlying stream that this
        /// combinator is pulling from.
        ///
        /// Note that care must be taken to avoid tampering with the state of the
        /// stream which may otherwise confuse this combinator.
        pub fn get_mut(&mut self) -> &mut S {
            &mut self.stream
        }

        /// Consumes this combinator, returning the underlying stream.
        ///
        /// Note that this may discard intermediate state of this combinator, so
        /// care should be taken to avoid losing resources when this is called.
        pub fn into_inner(self) -> S {
            self.stream
        }
    }

    // Forwarding impl of Sink from the underlying stream
    impl<S, P, R> ::sink::Sink for SkipWhile<S, P, R>
        where S: ::sink::Sink + Stream, R: IntoFuture
    {
        type SinkItem = S::SinkItem;
        type SinkError = S::SinkError;

        fn start_send(&mut self, item: S::SinkItem) -> ::StartSend<S::SinkItem, S::SinkError> {
            self.stream.start_send(item)
        }

        fn poll_complete(&mut self) -> Poll<(), S::SinkError> {
            self.stream.poll_complete()
        }

        fn close(&mut self) -> Poll<(), S::SinkError> {
            self.stream.close()
        }
    }

    impl<S, P, R> Stream for SkipWhile<S, P, R>
        where S: Stream,
              P: FnMut(&S::Item) -> R,
              R: IntoFuture<Item=bool, Error=S::Error>,
    {
        type Item = S::Item;
        type Error = S::Error;

        fn poll(&mut self) -> Poll<Option<S::Item>, S::Error> {
            if self.done_skipping {
                return self.stream.poll();
            }

            loop {
                if self.pending.is_none() {
                    let item = match try_ready!(self.stream.poll()) {
                        Some(e) => e,
                        None => return Ok(Async::Ready(None)),
                    };
                    self.pending = Some(((self.pred)(&item).into_future(), item));
                }

                assert!(self.pending.is_some());
                match self.pending.as_mut().unwrap().0.poll() {
                    Ok(Async::Ready(true)) => self.pending = None,
                    Ok(Async::Ready(false)) => {
                        let (_, item) = self.pending.take().unwrap();
                        self.done_skipping = true;
                        return Ok(Async::Ready(Some(item)))
                    }
                    Ok(Async::NotReady) => return Ok(Async::NotReady),
                    Err(e) => {
                        self.pending = None;
                        return Err(e)
                    }
                }
            }
        }
    }

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