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63 lines
1.5 KiB
Rust
63 lines
1.5 KiB
Rust
//@ revisions: explicit implicit
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//@ run-pass
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// Test the execution of deref patterns.
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#![feature(deref_patterns)]
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#![allow(incomplete_features)]
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#[cfg(explicit)]
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fn branch(vec: Vec<u32>) -> u32 {
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match vec {
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deref!([]) => 0,
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deref!([1, _, 3]) => 1,
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deref!([2, ..]) => 2,
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_ => 1000,
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}
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}
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#[cfg(implicit)]
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fn branch(vec: Vec<u32>) -> u32 {
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match vec {
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[] => 0,
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[1, _, 3] => 1,
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[2, ..] => 2,
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_ => 1000,
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}
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}
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#[cfg(explicit)]
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fn nested(vec: Vec<Vec<u32>>) -> u32 {
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match vec {
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deref!([deref!([]), ..]) => 1,
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deref!([deref!([0, ..]), deref!([1, ..])]) => 2,
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_ => 1000,
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}
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}
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#[cfg(implicit)]
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fn nested(vec: Vec<Vec<u32>>) -> u32 {
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match vec {
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[[], ..] => 1,
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[[0, ..], [1, ..]] => 2,
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_ => 1000,
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}
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}
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fn main() {
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assert!(matches!(Vec::<u32>::new(), deref!([])));
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assert!(matches!(vec![1], deref!([1])));
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assert!(matches!(&vec![1], deref!([1])));
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assert!(matches!(vec![&1], deref!([1])));
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assert!(matches!(vec![vec![1]], deref!([deref!([1])])));
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assert_eq!(branch(vec![]), 0);
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assert_eq!(branch(vec![1, 2, 3]), 1);
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assert_eq!(branch(vec![3, 2, 1]), 1000);
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assert_eq!(branch(vec![2]), 2);
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assert_eq!(branch(vec![2, 3]), 2);
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assert_eq!(branch(vec![3, 2]), 1000);
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assert_eq!(nested(vec![vec![], vec![2]]), 1);
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assert_eq!(nested(vec![vec![0], vec![1]]), 2);
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assert_eq!(nested(vec![vec![0, 2], vec![1, 2]]), 2);
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}
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