| use core::iter::*; | |
| #[test] | |
| fn test_copied() { | |
| let xs = [2, 4, 6, 8]; | |
| let mut it = xs.iter().copied(); | |
| assert_eq!(it.len(), 4); | |
| assert_eq!(it.next(), Some(2)); | |
| assert_eq!(it.len(), 3); | |
| assert_eq!(it.next(), Some(4)); | |
| assert_eq!(it.len(), 2); | |
| assert_eq!(it.next_back(), Some(8)); | |
| assert_eq!(it.len(), 1); | |
| assert_eq!(it.next_back(), Some(6)); | |
| assert_eq!(it.len(), 0); | |
| assert_eq!(it.next_back(), None); | |
| } |