1 files changed, 9 insertions, 0 deletions
diff --git a/libcxx/test/atomics/atomics.flag/default.pass.cpp b/libcxx/test/atomics/atomics.flag/default.pass.cpp
index 489e3d2b8f8..5c077b0a166 100644
--- a/libcxx/test/atomics/atomics.flag/default.pass.cpp
+++ b/libcxx/test/atomics/atomics.flag/default.pass.cpp
@@ -14,9 +14,18 @@
 // atomic_flag() = default;
 
 #include <atomic>
+#include <new>
 #include <cassert>
 
 int main()
 {
     std::atomic_flag f;
+
+    {
+        typedef std::atomic_flag A;
+        _ALIGNAS_TYPE(A) char storage[sizeof(A)] = {1};
+        A& zero = *new (storage) A();
+        assert(!zero.test_and_set());
+        zero.~A();
+    }
 }