1 files changed, 42 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-39367.rs b/tests/ui/issues/issue-39367.rs
new file mode 100644
index 00000000000..e7beb8a0392
--- /dev/null
+++ b/tests/ui/issues/issue-39367.rs
@@ -0,0 +1,42 @@
+// run-pass
+// revisions: mir thir
+// [thir]compile-flags: -Zthir-unsafeck
+
+use std::ops::Deref;
+
+struct ArenaSet<U: Deref, V=<U as Deref>::Target>(U, &'static V)
+    where V: 'static + ?Sized;
+
+static Z: [u8; 4] = [1,2,3,4];
+
+fn arena() -> &'static ArenaSet<Vec<u8>> {
+    fn __static_ref_initialize() -> ArenaSet<Vec<u8>> {
+        ArenaSet(vec![], &Z)
+    }
+    unsafe {
+        use std::sync::Once;
+        fn require_sync<T: Sync>(_: &T) { }
+        unsafe fn __stability() -> &'static ArenaSet<Vec<u8>> {
+            use std::mem::transmute;
+            static mut DATA: *const ArenaSet<Vec<u8>> = std::ptr::null_mut();
+
+            static mut ONCE: Once = Once::new();
+            ONCE.call_once(|| {
+                DATA = transmute
+                    ::<Box<ArenaSet<Vec<u8>>>, *const ArenaSet<Vec<u8>>>
+                    (Box::new(__static_ref_initialize()));
+            });
+
+            &*DATA
+        }
+        let static_ref = __stability();
+        require_sync(static_ref);
+        static_ref
+    }
+}
+
+fn main() {
+    let &ArenaSet(ref u, v) = arena();
+    assert!(u.is_empty());
+    assert_eq!(v, Z);
+}