You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: bilock.rs
    path of file: ./repos/phaser/phaser/vendor/futures-util/benches_disabled
    
    the code of the file until where you have to start completion: #![feature(test)]

#[cfg(feature = "bilock")]
mod bench {
    use futures::executor::LocalPool;
    use futures::task::{Context, Waker};
    use futures_util::lock::BiLock;
    use futures_util::lock::BiLockAcquire;
    use futures_util::lock::BiLockAcquired;
    use futures_util::task::ArcWake;

    use std::sync::Arc;
    use test::Bencher;

    fn notify_noop() -> Waker {
        struct Noop;

        impl ArcWake for Noop {
            fn wake(_: &Arc<Self>) {}
        }

        ArcWake::into_waker(Arc::new(Noop))
    }

    /// Pseudo-stream which simply calls `lock.poll()` on `poll`
    struct LockStream {
        lock: BiLockAcquire<u32>,
    }

    impl LockStream {
        fn new(lock: BiLock<u32>) -> Self {
            Self { lock: lock.lock() }
        }

        /// Release a lock after it was acquired in `poll`,
        /// so `poll` could be called again.
        fn release_lock(&mut self, guard: BiLockAcquired<u32>) {
            self.lock = guard.unlock().lock()
        }
    }

    impl Stream for LockStream {
        type Item = BiLockAcquired<u32>;
        type Error = ();

        fn poll_next(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>, Self::Error> {
            self.lock.poll(cx).map(|a| a.map(Some))
        }
    }

    #[bench]
    fn contended(b: &mut Bencher) {
        let pool = LocalPool::new();
        let mut exec = pool.executor();
        let waker = notify_noop();
        let mut map = task::LocalMap::new();
        let mut waker = task::Context::new(&mut map, &waker, &mut exec);

        b.iter(|| {
            let (x, y) = BiLock::new(1);

            let mut x = LockStream::new(x);
            let mut y = LockStream::new(y);

            for _ in 0..1000 {
                let x_guard = match x.poll_next(&mut waker) {
                    Ok(Poll::Ready(Some(guard))) => guard,
                    _ => panic!(),
                };

                // Try poll second lock while first lock still holds the lock
                match y.poll_next(&mut waker) {
                    Ok(Poll::Pending) => (),
                    _ => panic!(),
                };

                x.release_lock(x_guard);

                let y_guard = match y.poll_next(&mut waker) {
                    Ok(Poll::Ready(Some(guard))) => guard,
                    _ => panic!(),
                };

                y.release_lock(y_guard);
            }
            (x, y)
        });
    }

    #[bench]
    fn lock_unlock(b: &mut Bencher) {
        let pool = LocalPool::new();
        let mut exec = pool.ex
    
    fn notify_noop() -> Waker {
        struct Noop;

        impl ArcWake for Noop {
            fn wake(_: &Arc<Self>) {}
        }

        ArcWake::into_waker(Arc::new(Noop))
    }

    /// Pseudo-stream which simply calls `lock.poll()` on `poll`
    struct LockStream {
        lock: BiLockAcquire<u32>,
    }

    impl LockStream {
        fn new(lock: BiLock<u32>) -> Self {
            Self { lock: lock.lock() }
        }

        /// Release a lock after it was acquired in `poll`,
        /// so `poll` could be called again.
        fn release_lock(&mut self, guard: BiLockAcquired<u32>) {
            self.lock = guard.unlock().lock()
        }
    }

    impl Stream for LockStream {
        type Item = BiLockAcquired<u32>;
        type Error = ();

        fn poll_next(&mut self, cx: &mut Context<'_>) -> Poll<Option<Self::Item>, Self::Error> {
            self.lock.poll(cx).map(|a| a.map(Some))
        }
    }

    #[bench]
    fn contended(b: &mut Bencher) {
        let pool = LocalPool::new();
        let mut exec = pool.executor();
        let waker = notify_noop();
        let mut map = task::LocalMap::new();
        let mut waker = task::Context::new(&mut map, &waker, &mut exec);

        b.iter(|| {
            let (x, y) = BiLock::new(1);

            let mut x = LockStream::new(x);
            let mut y = LockStream::new(y);

            for _ in 0..1000 {
                let x_guard = match x.poll_next(&mut waker) {
                    Ok(Poll::Ready(Some(guard))) => guard,
                    _ => panic!(),
                };

                // Try poll second lock while first lock still holds the lock
                match y.poll_next(&mut waker) {
                    Ok(Poll::Pending) => (),
                    _ => panic!(),
                };

                x.release_lock(x_guard);

                let y_guard = match y.poll_next(&mut waker) {
                    Ok(Poll::Ready(Some(guard))) => guard,
                    _ => panic!(),
                };

                y.release_lock(y_guard);
            }
            (x, y)
        });
    }

    #[bench]
    fn lock_unlock(b: &mut Bencher) {
        let pool = LocalPool::new();
        let mut exec = pool.executor();
        let waker = notify_noop();
        let mut map = task::LocalMap::new();
        let mut waker = task::Context::new(&mut map, &waker, &mut exec);

        b.iter(|| {
            let (x, y) = BiLock::new(1);

            let mut x = LockStream::new(x);
            let mut y = LockStream::new(y);

            for _ in 0..1000 {
                let x_guard = match x.poll_next(&mut waker) {
                    Ok(Poll::Ready(Some(guard))) => guard,
                    _ => panic!(),
                };

                x.release_lock(x_guard);

                let y_guard = match y.poll_next(&mut waker) {
                    Ok(Poll::Ready(Some(guard))) => guard,
                    _ => panic!(),
                };

                y.release_lock(y_guard);
            }
            (x, y)
        })
    }
}