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    use super::plumbing::*;

    pub(super) struct NoopConsumer;

    impl NoopConsumer {
        pub(super) fn new() -> Self {
            NoopConsumer
        }
    }

    impl<T> Consumer<T> for NoopConsumer {
        type Folder = NoopConsumer;
        type Reducer = NoopReducer;
        type Result = ();

        fn split_at(self, _index: usize) -> (Self, Self, NoopReducer) {
            (NoopConsumer, NoopConsumer, NoopReducer)
        }

        fn into_folder(self) -> Self {
            self
        }

        fn full(&self) -> bool {
            false
        }
    }

    impl<T> Folder<T> for NoopConsumer {
        type Result = ();

        fn consume(self, _item: T) -> Self {
            self
        }

        fn consume_iter<I>(self, iter: I) -> Self
        where
            I: IntoIterator<Item = T>,
        {
            iter.into_iter().fold((), |_, _| ());
            self
        }

        fn complete(self) {}

        fn full(&self) -> bool {
            false
        }
    }

    impl<T> UnindexedConsumer<T> for NoopConsumer {
        fn split_off_left(&self) -> Self {
            NoopConsumer
        }

        fn to_reducer(&self) -> NoopReducer {
            NoopReducer
        }
    }

    pub(super) struct NoopReducer;

    impl Reducer<()> for NoopReducer {
        fn reduce(self, _left: (), _right: ()) {}
    }

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