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    use std::prelude::v1::*;

    use std::mem;

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

    /// A future which collects all of the values of a stream into a vector.
    ///
    /// This future is created by the `Stream::collect` method.
    #[derive(Debug)]
    #[must_use = "streams do nothing unless polled"]
    pub struct Collect<S> where S: Stream {
        stream: S,
        items: Vec<S::Item>,
    }

    pub fn new<S>(s: S) -> Collect<S>
        where S: Stream,
    {
        Collect {
            stream: s,
            items: Vec::new(),
        }
    }

    impl<S: Stream> Collect<S> {
        fn finish(&mut self) -> Vec<S::Item> {
            mem::replace(&mut self.items, Vec::new())
        }
    }

    impl<S> Future for Collect<S>
        where S: Stream,
    {
        type Item = Vec<S::Item>;
        type Error = S::Error;

        fn poll(&mut self) -> Poll<Vec<S::Item>, S::Error> {
            loop {
                match self.stream.poll() {
                    Ok(Async::Ready(Some(e))) => self.items.push(e),
                    Ok(Async::Ready(None)) => return Ok(Async::Ready(self.finish())),
                    Ok(Async::NotReady) => return Ok(Async::NotReady),
                    Err(e) => {
                        self.finish();
                        return Err(e)
                    }
                }
            }
        }
    }

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