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Jan 18th, 2019
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  1. let mut v = vec![1, 2, 3, 4, 5];
  2. let r = v
  3. .get_mut(1..=2)
  4. .map(|x| x.iter_mut().for_each(|y| *y *= 10));
  5. if r.is_some() {
  6. println!("Succeed : {:?}", v);
  7. } else {
  8. println!("Not Succeed. Do something here.");
  9. }
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