mirror of https://github.com/rust-lang/rust
36 lines
762 B
Rust
36 lines
762 B
Rust
// Test bindings-after-at with box-patterns
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//@ run-pass
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#![feature(box_patterns)]
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#[derive(Debug, PartialEq)]
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enum MatchArm {
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Arm(usize),
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Wild,
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}
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fn test(x: Option<Box<i32>>) -> MatchArm {
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match x {
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ref bar @ Some(box n) if n > 0 => {
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// bar is a &Option<Box<i32>>
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assert_eq!(bar, &x);
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MatchArm::Arm(0)
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},
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Some(ref bar @ box n) if n < 0 => {
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// bar is a &Box<i32> here
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assert_eq!(**bar, n);
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MatchArm::Arm(1)
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},
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_ => MatchArm::Wild,
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}
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}
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fn main() {
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assert_eq!(test(Some(Box::new(2))), MatchArm::Arm(0));
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assert_eq!(test(Some(Box::new(-1))), MatchArm::Arm(1));
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assert_eq!(test(Some(Box::new(0))), MatchArm::Wild);
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}
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