rollup merge of #22142: Kimundi/unsized_unique

This is to allow for use cases like sending a raw pointer slice across thread boundaries.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/libcoretest/ptr.rs b/src/libcoretest/ptr.rs
index 7f0b97c53d4..2365b907b3f 100644
--- a/src/libcoretest/ptr.rs
+++ b/src/libcoretest/ptr.rs
@@ -167,3 +167,12 @@ fn test_set_memory() {
     unsafe { set_memory(ptr, 5u8, xs.len()); }
     assert!(xs == [5u8; 20]);
 }
+
+#[test]
+fn test_unsized_unique() {
+    let xs: &mut [_] = &mut [1, 2, 3];
+    let ptr = Unique(xs as *mut [_]);
+    let ys = unsafe { &mut *ptr.0 };
+    let zs: &mut [_] = &mut [1, 2, 3];
+    assert!(ys == zs);
+}