diff options
| -rw-r--r-- | library/core/tests/iter/adapters/flatten.rs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/library/core/tests/iter/adapters/flatten.rs b/library/core/tests/iter/adapters/flatten.rs index bd2c6fd9252..4bbae6947bf 100644 --- a/library/core/tests/iter/adapters/flatten.rs +++ b/library/core/tests/iter/adapters/flatten.rs @@ -64,6 +64,14 @@ fn test_flatten_non_fused_outer() { assert_eq!(iter.next_back(), Some(1)); assert_eq!(iter.next(), Some(0)); assert_eq!(iter.next(), None); + assert_eq!(iter.next(), None); + + let mut iter = NonFused::new(once(0..2)).flatten(); + + assert_eq!(iter.next(), Some(0)); + assert_eq!(iter.next_back(), Some(1)); + assert_eq!(iter.next_back(), None); + assert_eq!(iter.next_back(), None); } #[test] @@ -74,6 +82,15 @@ fn test_flatten_non_fused_inner() { assert_eq!(iter.next(), Some(0)); assert_eq!(iter.next(), Some(1)); assert_eq!(iter.next(), None); + assert_eq!(iter.next(), None); + + let mut iter = once(0..1).chain(once(1..3)).flat_map(NonFused::new); + + assert_eq!(iter.next(), Some(0)); + assert_eq!(iter.next_back(), Some(2)); + assert_eq!(iter.next_back(), Some(1)); + assert_eq!(iter.next_back(), None); + assert_eq!(iter.next_back(), None); } #[test] |