1 files changed, 33 insertions, 0 deletions
diff --git a/test/std/atomics/atomics.flag/default.pass.cpp b/test/std/atomics/atomics.flag/default.pass.cpp
new file mode 100644
index 000000000000..45f5e709245b
--- /dev/null
+++ b/test/std/atomics/atomics.flag/default.pass.cpp
@@ -0,0 +1,33 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: libcpp-has-no-threads
+
+// <atomic>
+
+// struct atomic_flag
+
+// 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();
+    }
+}