Fix Peekable::next_back
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@ -1468,7 +1468,11 @@ where
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{
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#[inline]
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fn next_back(&mut self) -> Option<Self::Item> {
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self.iter.next_back().or_else(|| self.peeked.take().and_then(|x| x))
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match self.peeked.as_mut() {
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Some(v @ Some(_)) => self.iter.next_back().or_else(|| v.take()),
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Some(None) => None,
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None => self.iter.next_back(),
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}
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}
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#[inline]
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