--- /dev/null
+//===----------------------------------------------------------------------===//
+//
+// 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: c++98, c++03
+
+// type_traits
+
+// aligned_union<size_t Len, class ...Types>
+
+#include <type_traits>
+
+class A; // Incomplete
+
+int main()
+{
+ typedef std::aligned_union<10, A>::type T1;
+}