rust/library/core/tests/iter/adapters/copied.rs

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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);
}