File: borrowck-ref-mut-of-imm.rs

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rustc 1.85.0%2Bdfsg2-3
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fn destructure(x: Option<isize>) -> isize {
    match x {
      None => 0,
      Some(ref mut v) => *v //~ ERROR cannot borrow
    }
}

fn main() {
    assert_eq!(destructure(Some(22)), 22);
}