don't require ParitalEq to the Item of DedupBy
@@ -763,7 +763,6 @@ impl<I, Pred> fmt::Debug for DedupBy<I, Pred>
impl<I, Pred> Iterator for DedupBy<I, Pred>
where I: Iterator,
- I::Item: PartialEq,
Pred: DedupPredicate<I::Item>,
{
type Item = I::Item;
