message: Set upper bound in size_hint of vector iterators.
diff: @@ -25,7 +25,8 @@ impl<T: VectorElement> Iterator for VectorIterator<T> where Vector<T>: VectorExt
  }
  fn size_hint(&self) -> (usize, Option<usize>) {
  - (self.vec.len(), None)
  + let len = self.vec.len();
  + (len, Some(len))
  }
  fn nth(&mut self, n: usize) -> Option<Self::Item> {
  @@ -33,11 +34,7 @@ impl<T: VectorElement> Iterator for VectorIterator<T> where Vector<T>: VectorExt
  }
  }
  -impl<T: VectorElement> ExactSizeIterator for VectorIterator<T> where Vector<T>: VectorExtern<T> {
  - fn len(&self) -> usize {
  - self.vec.len()
  - }
  -}
  +impl<T: VectorElement> ExactSizeIterator for VectorIterator<T> where Vector<T>: VectorExtern<T> {}
  impl<T: VectorElement> FusedIterator for VectorIterator<T> where Vector<T>: VectorExtern<T> {}
  @@ -62,7 +59,8 @@ impl<T: VectorElement> Iterator for VectorRefIterator<'_, T> where Vector<T>: Ve
  }
  fn size_hint(&self) -> (usize, Option<usize>) {
  - (self.vec.len(), None)
  + let len = self.vec.len();
  + (len, Some(len))
  }
  fn nth(&mut self, n: usize) -> Option<Self::Item> {
  @@ -70,10 +68,6 @@ impl<T: VectorElement> Iterator for VectorRefIterator<'_, T> where Vector<T>: Ve
  }
  }
  -impl<T: VectorElement> ExactSizeIterator for VectorRefIterator<'_, T> where Vector<T>: VectorExtern<T> {
  - fn len(&self) -> usize {
  - self.vec.len()
  - }
  -}
  +impl<T: VectorElement> ExactSizeIterator for VectorRefIterator<'_, T> where Vector<T>: VectorExtern<T> {}
  impl<T: VectorElement> FusedIterator for VectorRefIterator<'_, T> where Vector<T>: VectorExtern<T> {}
  