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    use stream::Stream;
    use executor;

    /// A stream combinator which converts an asynchronous stream to a **blocking
    /// iterator**.
    ///
    /// Created by the `Stream::wait` method, this function transforms any stream
    /// into a standard iterator. This is implemented by blocking the current thread
    /// while items on the underlying stream aren't ready yet.
    #[must_use = "iterators do nothing unless advanced"]
    #[derive(Debug)]
    pub struct Wait<S> {
        stream: executor::Spawn<S>,
    }

    impl<S> Wait<S> {
        /// Acquires a reference to the underlying stream that this combinator is
        /// pulling from.
        pub fn get_ref(&self) -> &S {
            self.stream.get_ref()
        }

        /// 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 {
            self.stream.get_mut()
        }

        /// 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.into_inner()
        }
    }

    pub fn new<S: Stream>(s: S) -> Wait<S> {
        Wait {
            stream: executor::spawn(s),
        }
    }

    impl<S: Stream> Iterator for Wait<S> {
        type Item = Result<S::Item, S::Error>;

        fn next(&mut self) -> Option<Self::Item> {
            self.stream.wait_stream()
        }
    }

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