File: issue-33819.rs

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rustc 1.89.0%2Bdfsg1-1
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fn main() {
    let mut op = Some(2);
    match op {
        Some(ref v) => { let a = &mut v; },
        //~^ ERROR cannot borrow `v` as mutable, as it is not declared as mutable
        //~| HELP try removing `&mut` here
        None => {},
    }
}