Rollup merge of #81811 - schteve:fix_vec_retain_doc_test, r=m-ou-se
Fix doc test for Vec::retain(), now passes clippy::eval_order_dependence Doc test for Vec::retain() works correctly but is flagged by clippy::eval_order_dependence. Fix avoids the issue by using an iterator instead of an index.
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@ -1385,13 +1385,14 @@ impl<T, A: Allocator> Vec<T, A> {
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/// assert_eq!(vec, [2, 4]);
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/// ```
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///
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/// The exact order may be useful for tracking external state, like an index.
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/// Because the elements are visited exactly once in the original order,
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/// external state may be used to decide which elements to keep.
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///
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/// ```
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/// let mut vec = vec![1, 2, 3, 4, 5];
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/// let keep = [false, true, true, false, true];
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/// let mut i = 0;
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/// vec.retain(|_| (keep[i], i += 1).0);
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/// let mut iter = keep.iter();
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/// vec.retain(|_| *iter.next().unwrap());
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/// assert_eq!(vec, [2, 3, 5]);
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/// ```
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#[stable(feature = "rust1", since = "1.0.0")]
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