assert_eq!(c2.next(), None);
}
+#[test]
+fn test_chunks_nth_back() {
+ let v: &[i32] = &[0, 1, 2, 3, 4, 5];
+ let mut c = v.chunks(2);
+ assert_eq!(c.nth_back(1).unwrap(), &[2, 3]);
+ assert_eq!(c.next().unwrap(), &[0, 1]);
+ assert_eq!(c.next(), None);
+
+ let v2: &[i32] = &[0, 1, 2, 3, 4];
+ let mut c2 = v2.chunks(3);
+ assert_eq!(c2.nth_back(1).unwrap(), &[0, 1, 2]);
+ assert_eq!(c2.next(), None);
+ assert_eq!(c2.next_back(), None);
+
+ let v3: &[i32] = &[0, 1, 2, 3, 4];
+ let mut c3 = v3.chunks(10);
+ assert_eq!(c3.nth_back(0).unwrap(), &[0, 1, 2, 3, 4]);
+ assert_eq!(c3.next(), None);
+
+ let v4: &[i32] = &[0, 1, 2];
+ let mut c4 = v4.chunks(10);
+ assert_eq!(c4.nth_back(1_000_000_000usize), None);
+}
+
#[test]
fn test_chunks_last() {
let v: &[i32] = &[0, 1, 2, 3, 4, 5];
assert_eq!(c2.next(), None);
}
+#[test]
+fn test_rchunks_nth_back() {
+ let v: &[i32] = &[0, 1, 2, 3, 4, 5];
+ let mut c = v.rchunks(2);
+ assert_eq!(c.nth_back(1).unwrap(), &[2, 3]);
+ assert_eq!(c.next_back().unwrap(), &[4, 5]);
+
+ let v2: &[i32] = &[0, 1, 2, 3, 4];
+ let mut c2 = v2.rchunks(3);
+ assert_eq!(c2.nth_back(1).unwrap(), &[2, 3, 4]);
+ assert_eq!(c2.next_back(), None);
+}
+
#[test]
fn test_rchunks_last() {
let v: &[i32] = &[0, 1, 2, 3, 4, 5];
assert_eq!(c2.next(), None);
}
+#[test]
+fn test_rchunks_mut_nth_back() {
+ let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
+ let mut c = v.rchunks_mut(2);
+ assert_eq!(c.nth_back(1).unwrap(), &[2, 3]);
+ assert_eq!(c.next_back().unwrap(), &[4, 5]);
+
+ let v2: &mut [i32] = &mut [0, 1, 2, 3, 4];
+ let mut c2 = v2.rchunks_mut(3);
+ assert_eq!(c2.nth_back(1).unwrap(), &[2, 3, 4]);
+ assert_eq!(c2.next_back(), None);
+}
+
#[test]
fn test_rchunks_mut_last() {
let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
assert_eq!(c2.next(), None);
}
+#[test]
+fn test_rchunks_exact_nth_back() {
+ let v: &[i32] = &[0, 1, 2, 3, 4, 5];
+ let mut c = v.rchunks_exact(2);
+ assert_eq!(c.nth_back(1).unwrap(), &[2, 3]);
+ assert_eq!(c.next_back().unwrap(), &[4, 5]);
+
+ let v2: &[i32] = &[0, 1, 2, 3, 4, 5, 6];
+ let mut c2 = v2.rchunks_exact(3);
+ assert_eq!(c2.nth_back(1).unwrap(), &[4, 5, 6]);
+ assert_eq!(c2.next(), None);
+}
+
#[test]
fn test_rchunks_exact_last() {
let v: &[i32] = &[0, 1, 2, 3, 4, 5];
assert_eq!(c2.next(), None);
}
+#[test]
+fn test_rchunks_exact_mut_nth_back() {
+ let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
+ let mut c = v.rchunks_exact_mut(2);
+ assert_eq!(c.nth_back(1).unwrap(), &[2, 3]);
+ assert_eq!(c.next_back().unwrap(), &[4, 5]);
+
+ let v2: &mut [i32] = &mut [0, 1, 2, 3, 4, 5, 6];
+ let mut c2 = v2.rchunks_exact_mut(3);
+ assert_eq!(c2.nth_back(1).unwrap(), &[4, 5, 6]);
+ assert_eq!(c2.next(), None);
+}
+
#[test]
fn test_rchunks_exact_mut_last() {
let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
let mut bytes = *b"Hello, World!";
bytes.copy_within(.., 0);
assert_eq!(&bytes, b"Hello, World!");
+
+ // Ensure that copying at the end of slice won't cause UB.
+ let mut bytes = *b"Hello, World!";
+ bytes.copy_within(13..13, 5);
+ assert_eq!(&bytes, b"Hello, World!");
+ bytes.copy_within(5..5, 13);
+ assert_eq!(&bytes, b"Hello, World!");
}
#[test]
// 2 is greater than 1, so this range is invalid.
bytes.copy_within(2..1, 0);
}
+#[test]
+#[should_panic(expected = "attempted to index slice up to maximum usize")]
+fn test_copy_within_panics_src_out_of_bounds() {
+ let mut bytes = *b"Hello, World!";
+ // an inclusive range ending at usize::max_value() would make src_end overflow
+ bytes.copy_within(usize::max_value()..=usize::max_value(), 0);
+}
#[test]
fn test_is_sorted() {