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/// An iterator whose items are random accessible efficiently /// /// # Safety /// /// The iterator's .len() and size_hint() must be exact. /// `.len()` must be cheap to call. /// /// .get_unchecked() must return distinct mutable references for distinct /// indices (if applicable), and must return a valid reference if index is in /// 0..self.len(). #[doc(hidden)] pub unsafe trait TrustedRandomAccess : ExactSizeIterator { unsafe fn get_unchecked(&mut self, i: usize) -> Self::Item; /// Returns `true` if getting an iterator element may have /// side effects. Remember to take inner iterators into account. fn may_have_side_effect() -> bool; }