43 lines
868 B
Rust
43 lines
868 B
Rust
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// Test or-patterns with slice-patterns
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// run-pass
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#![feature(or_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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#[derive(Debug)]
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enum Test {
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Foo,
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Bar,
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Baz,
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Qux,
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}
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fn test(foo: &[Option<Test>]) -> MatchArm {
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match foo {
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[.., Some(Test::Foo | Test::Qux)] => MatchArm::Arm(0),
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[Some(Test::Foo), .., Some(Test::Bar | Test::Baz)] => MatchArm::Arm(1),
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[.., Some(Test::Bar | Test::Baz), _] => MatchArm::Arm(2),
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_ => MatchArm::Wild,
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}
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}
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fn main() {
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let foo = vec![
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Some(Test::Foo),
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Some(Test::Bar),
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Some(Test::Baz),
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Some(Test::Qux),
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];
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assert_eq!(test(&foo), MatchArm::Arm(0));
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assert_eq!(test(&foo[..3]), MatchArm::Arm(1));
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assert_eq!(test(&foo[1..3]), MatchArm::Arm(2));
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assert_eq!(test(&foo[4..]), MatchArm::Wild);
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}
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