Integers are copies
- Make the copy mutable
fn main() {
let a = 23;
println!("{a}");
let mut b = a;
println!("{b}");
b = 42;
println!("{a}");
println!("{b}");
}23
23
23
42
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fn main() {
let a = 23;
println!("{a}");
let mut b = a;
println!("{b}");
b = 42;
println!("{a}");
println!("{b}");
}23
23
23
42