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16 lines
311 B
Rust
16 lines
311 B
Rust
// run-pass
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fn select<'r>(x: &'r Option<isize>, y: &'r Option<isize>) -> &'r Option<isize> {
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match (x, y) {
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(&None, &None) => x,
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(&Some(_), _) => x,
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(&None, &Some(_)) => y
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}
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}
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pub fn main() {
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let x = None;
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let y = Some(3);
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assert_eq!(select(&x, &y).unwrap(), 3);
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}
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