File: borrowed-ptr-pattern-option.rs

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rustc 1.88.0%2Bdfsg1-1
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//@ run-pass

fn select<'r>(x: &'r Option<isize>, y: &'r Option<isize>) -> &'r Option<isize> {
    match (x, y) {
        (&None, &None) => x,
        (&Some(_), _) => x,
        (&None, &Some(_)) => y
    }
}

pub fn main() {
    let x = None;
    let y = Some(3);
    assert_eq!(select(&x, &y).unwrap(), 3);
}