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