File: issue-10876.rs

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rustc 1.85.0%2Bdfsg2-3
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//@ check-pass

enum Nat {
    S(Box<Nat>),
    Z
}
fn test(x: &mut Nat) {
    let mut p = &mut *x;
    loop {
        match p {
            &mut Nat::Z => break,
            &mut Nat::S(ref mut n) => p = &mut *n
        }
    }
}

fn main() {}