assert_eq!(it.next_back(), Some((3, 3)));
assert_eq!(it.next(), None);
}
+
+#[test]
+fn test_issue_82282() {
+ fn overflowed_zip(arr: &[i32]) -> impl Iterator<Item = (i32, &())> {
+ static UNIT_EMPTY_ARR: [(); 0] = [];
+
+ let mapped = arr.into_iter().map(|i| *i);
+ let mut zipped = mapped.zip(UNIT_EMPTY_ARR.iter());
+ zipped.next();
+ zipped
+ }
+
+ let arr = [1, 2, 3];
+ let zip = overflowed_zip(&arr).zip(overflowed_zip(&arr));
+
+ assert_eq!(zip.size_hint(), (0, Some(0)));
+ for _ in zip {
+ panic!();
+ }
+}
+
+#[test]
+fn test_issue_82291() {
+ use std::cell::Cell;
+
+ let mut v1 = [()];
+ let v2 = [()];
+
+ let called = Cell::new(0);
+
+ let mut zip = v1
+ .iter_mut()
+ .map(|r| {
+ called.set(called.get() + 1);
+ r
+ })
+ .zip(&v2);
+
+ zip.next_back();
+ assert_eq!(called.get(), 1);
+ zip.next();
+ assert_eq!(called.get(), 1);
+}