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    use iter::plumbing::*;
    use iter::Either::{Left, Right};
    use iter::*;

    /// `Either<L, R>` is a parallel iterator if both `L` and `R` are parallel iterators.
    impl<L, R> ParallelIterator for Either<L, R>
    where
        L: ParallelIterator,
        R: ParallelIterator<Item = L::Item>,
    {
        type Item = L::Item;

        fn drive_unindexed<C>(self, consumer: C) -> C::Result
        where
            C: UnindexedConsumer<Self::Item>,
        {
            match self {
                Left(iter) => iter.drive_unindexed(consumer),
                Right(iter) => iter.drive_unindexed(consumer),
            }
        }

        fn opt_len(&self) -> Option<usize> {
            self.as_ref().either(L::opt_len, R::opt_len)
        }
    }

    impl<L, R> IndexedParallelIterator for Either<L, R>
    where
        L: IndexedParallelIterator,
        R: IndexedParallelIterator<Item = L::Item>,
    {
        fn drive<C>(self, consumer: C) -> C::Result
        where
            C: Consumer<Self::Item>,
        {
            match self {
                Left(iter) => iter.drive(consumer),
                Right(iter) => iter.drive(consumer),
            }
        }

        fn len(&self) -> usize {
            self.as_ref().either(L::len, R::len)
        }

        fn with_producer<CB>(self, callback: CB) -> CB::Output
        where
            CB: ProducerCallback<Self::Item>,
        {
            match self {
                Left(iter) => iter.with_producer(callback),
                Right(iter) => iter.with_producer(callback),
            }
        }
    }

    /// `Either<L, R>` can be extended if both `L` and `R` are parallel extendable.
    impl<L, R, T> ParallelExtend<T> for Either<L, R>
    where
        L: ParallelExtend<T>,
        R: ParallelExtend<T>,
        T: Send,
    {
        fn par_extend<I>(&mut self, par_iter: I)
        where
            I: IntoParallelIterator<Item = T>,
        {
            match self.as_mut() {
                Left(collection) => collection.par_extend(par_iter),
                Right(collection) => collection.par_extend(par_iter),
            }
        }
    }

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