I want each instance of the struct to be immutable, but I don't know how to do that and still reuse the variable name for the next go round of the loop. Help?

struct State {
    a: i32,
    b: i32,
}

fn iterate(s: &State) -> State {
    State {
        a: s.a + 1,
        b: s.b + 1,
    }
}

fn main() {
    let mut current_state = State { a: 0, b: 100 };

    for _ in 0..100 {
        current_state = iterate(&current_state);
        println!("a{} b{}", current_state.a, current_state.b);

        //current_state.a = 17;  // I don't want current state to be mutable here
    }
}

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