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}"); }
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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}"); }
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42