impl TrustedLen for vec::IntoIter

Author: bluss

src/libcollections/vec.rs

@@ -1944,6 +1944,9 @@ impl<T> ExactSizeIterator for IntoIter<T> {}
 #[unstable(feature = "fused", issue = "35602")]
 impl<T> FusedIterator for IntoIter<T> {}
 
+#[unstable(feature = "trusted_len", issue = "0")]
+unsafe impl<T> TrustedLen for IntoIter<T> {}
+
 #[stable(feature = "vec_into_iter_clone", since = "1.8.0")]
 impl<T: Clone> Clone for IntoIter<T> {
     fn clone(&self) -> IntoIter<T> {