--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/union3.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,68 @@
+// Runtime test for C++11 unrestricted unions
+// { dg-do run { target c++11 } }
+
+int c, d;
+struct A
+{
+  int i;
+  A(): i(1) { ++c; }
+  A(const A&): i(2) { ++c; }
+  ~A() { ++d; }
+};
+
+union B
+{
+  A a;
+  B() { }
+  B(const B& b) { }
+  ~B() { }
+};
+
+struct C
+{
+  union { A a; };
+  C() { }
+  C(const C&) { }
+  ~C() { }
+};
+
+union D
+{
+  A a;
+  D(): a() { }
+  D(const D& d): a(d.a) { }
+  ~D() { a.~A(); }
+};
+
+struct E
+{
+  union { A a; };
+  E(): a() { }
+  E(const E& e): a (e.a) { }
+  ~E() { a.~A(); }
+};
+
+int main()
+{
+  {
+    B b1;
+    B b2(b1);
+
+    C c1;
+    C c2(c1);
+  }
+
+  if (c != 0 || d != 0)
+    return c+d*10;
+
+  {
+    D d1;
+    D d2(d1);
+
+    E e1;
+    E e2(e1);
+  }
+
+  if (c != 4 || d != 4)
+    return c*100+d*1000;
+}