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    use super::plumbing::*;
    use super::*;

    /// An [`IndexedParallelIterator`] that iterates over two parallel iterators of equal
    /// length simultaneously.
    ///
    /// This struct is created by the [`zip_eq`] method on [`IndexedParallelIterator`],
    /// see its documentation for more information.
    ///
    /// [`zip_eq`]: trait.IndexedParallelIterator.html#method.zip_eq
    /// [`IndexedParallelIterator`]: trait.IndexedParallelIterator.html
    #[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
    #[derive(Debug, Clone)]
    pub struct ZipEq<A: IndexedParallelIterator, B: IndexedParallelIterator> {
        zip: Zip<A, B>,
    }

    impl<A, B> ZipEq<A, B>
    where
        A: IndexedParallelIterator,
        B: IndexedParallelIterator,
    {
        /// Create a new `ZipEq` iterator.
        pub(super) fn new(a: A, b: B) -> Self {
            ZipEq {
                zip: super::Zip::new(a, b),
            }
        }
    }

    impl<A, B> ParallelIterator for ZipEq<A, B>
    where
        A: IndexedParallelIterator,
        B: IndexedParallelIterator,
    {
        type Item = (A::Item, B::Item);

        fn drive_unindexed<C>(self, consumer: C) -> C::Result
        where
            C: UnindexedConsumer<Self::Item>,
        {
            bridge(self.zip, consumer)
        }

        fn opt_len(&self) -> Option<usize> {
            Some(self.zip.len())
        }
    }

    impl<A, B> IndexedParallelIterator for ZipEq<A, B>
    where
        A: IndexedParallelIterator,
        B: IndexedParallelIterator,
    {
        fn drive<C>(self, consumer: C) -> C::Result
        where
            C: Consumer<Self::Item>,
        {
            bridge(self.zip, consumer)
        }

        fn len(&self) -> usize {
            self.zip.len()
        }

        fn with_producer<CB>(self, callback: CB) -> CB::Output
        where
            CB: ProducerCallback<Self::Item>,
        {
            self.zip.with_producer(callback)
        }
    }

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