#[stable(feature = "rust1", since = "1.0.0")]
impl<I> ExactSizeIterator for Skip<I> where I: ExactSizeIterator {}
-#[stable(feature = "double_ended_skip_iterator", since = "1.8.0")]
+#[stable(feature = "double_ended_skip_iterator", since = "1.9.0")]
impl<I> DoubleEndedIterator for Skip<I> where I: DoubleEndedIterator + ExactSizeIterator {
fn next_back(&mut self) -> Option<Self::Item> {
if self.len() > 0 {