mirror of https://github.com/rust-lang/rust
52 lines
1.2 KiB
Rust
52 lines
1.2 KiB
Rust
// Test or-patterns with slice-patterns
|
|
|
|
//@ run-pass
|
|
|
|
#[derive(Debug, PartialEq)]
|
|
enum MatchArm {
|
|
Arm(usize),
|
|
Wild,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
enum Test {
|
|
Foo,
|
|
Bar,
|
|
Baz,
|
|
Qux,
|
|
}
|
|
|
|
fn test(foo: &[Option<Test>]) -> MatchArm {
|
|
match foo {
|
|
[.., Some(Test::Qux | Test::Foo)] => MatchArm::Arm(0),
|
|
[Some(Test::Foo), .., Some(Test::Baz | Test::Bar)] => MatchArm::Arm(1),
|
|
[.., Some(Test::Bar | Test::Baz), _] => MatchArm::Arm(2),
|
|
_ => MatchArm::Wild,
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let foo = vec![
|
|
Some(Test::Foo),
|
|
Some(Test::Bar),
|
|
Some(Test::Baz),
|
|
Some(Test::Qux),
|
|
];
|
|
|
|
// path 1a
|
|
assert_eq!(test(&foo), MatchArm::Arm(0));
|
|
// path 1b
|
|
assert_eq!(test(&[Some(Test::Bar), Some(Test::Foo)]), MatchArm::Arm(0));
|
|
// path 2a
|
|
assert_eq!(test(&foo[..3]), MatchArm::Arm(1));
|
|
// path 2b
|
|
assert_eq!(test(&[Some(Test::Foo), Some(Test::Foo), Some(Test::Bar)]), MatchArm::Arm(1));
|
|
// path 3a
|
|
assert_eq!(test(&foo[1..3]), MatchArm::Arm(2));
|
|
// path 3b
|
|
assert_eq!(test(&[Some(Test::Bar), Some(Test::Baz), Some(Test::Baz), Some(Test::Bar)]),
|
|
MatchArm::Arm(2));
|
|
// path 4
|
|
assert_eq!(test(&foo[4..]), MatchArm::Wild);
|
|
}
|