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- let mut v = vec![1, 2, 3, 4, 5];
- let r = v
- .get_mut(1..=2)
- .map(|x| x.iter_mut().for_each(|y| *y *= 10));
- if r.is_some() {
- println!("Succeed : {:?}", v);
- } else {
- println!("Not Succeed. Do something here.");
- }
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