Mutable iterator

---

examples/iterators/change/src/main.rs

fn main() {
    let mut numbers = [2, 3, 4];
    println!("{numbers:?}");

    for num in numbers.iter_mut() {
        *num += 1;
    }

    println!("{numbers:?}");
}

[2, 3, 4]
[3, 4, 5]