mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-26 00:34:06 +00:00
16 lines
312 B
Rust
16 lines
312 B
Rust
//@ 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);
|
|
}
|