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

    /// `Flatten` turns each element to an iterator, then flattens these iterators
    /// together. This struct is created by the [`flatten()`] method on
    /// [`ParallelIterator`].
    ///
    /// [`flatten()`]: trait.ParallelIterator.html#method.flatten
    /// [`ParallelIterator`]: trait.ParallelIterator.html
    #[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
    #[derive(Debug, Clone)]
    pub struct Flatten<I: ParallelIterator> {
        base: I,
    }

    impl<I, PI> Flatten<I>
    where
        I: ParallelIterator<Item = PI>,
        PI: IntoParallelIterator + Send,
    {
        /// Create a new `Flatten` iterator.
        pub(super) fn new(base: I) -> Self {
            Flatten { base }
        }
    }

    impl<I, PI> ParallelIterator for Flatten<I>
    where
        I: ParallelIterator<Item = PI>,
        PI: IntoParallelIterator + Send,
    {
        type Item = PI::Item;

        fn drive_unindexed<C>(self, consumer: C) -> C::Result
        where
            C: UnindexedConsumer<Self::Item>,
        {
            self.base.flat_map(|x| x).drive_unindexed(consumer)
        }
    }

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