Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 45 insertions, 0 deletions

diff --git a/tests/ui/const-generics/type-dependent/issue-70507.rs b/tests/ui/const-generics/type-dependent/issue-70507.rs
new file mode 100644
index 000000000..c72d9fbec
--- /dev/null
+++ b/tests/ui/const-generics/type-dependent/issue-70507.rs
@@ -0,0 +1,45 @@
+// run-pass
+
+trait ConstChunksExactTrait<T> {
+    fn const_chunks_exact<const N: usize>(&self) -> ConstChunksExact<'_, T, {N}>;
+}
+
+impl <T> ConstChunksExactTrait<T> for [T] {
+    fn const_chunks_exact<const N: usize>(&self) -> ConstChunksExact<'_, T, {N}> {
+        assert!(N != 0);
+        let rem = self.len() % N;
+        let len = self.len() - rem;
+        let (fst, _) = self.split_at(len);
+        ConstChunksExact { v: fst, }
+    }
+}
+
+struct ConstChunksExact<'a, T: 'a, const N: usize> {
+    v: &'a [T],
+}
+
+impl <'a, T: std::fmt::Debug, const N: usize> Iterator for ConstChunksExact<'a, T, {N}> {
+    type Item = &'a [T; N];
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.v.len() < N {
+            None
+        } else {
+            let (fst, snd) = self.v.split_at(N);
+
+            self.v = snd;
+            let ptr = fst.as_ptr() as *const _;
+            Some(unsafe { &*ptr})
+        }
+    }
+}
+
+fn main() {
+    let slice = &[1i32, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+
+    let mut iter = [[1, 2, 3], [4, 5, 6], [7, 8, 9]].iter();
+
+    for a in slice.const_chunks_exact::<3>() {
+        assert_eq!(a, iter.next().unwrap());
+    }
+}