--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/dc9.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,30 @@
+// PR c++/70468
+// { dg-do compile { target c++11 } }
+// { dg-additional-options -w }
+
+struct S {}; 
+
+template < typename = S > 
+class A 
+{
+public:
+  A () : f0 (), f1 () {}	// { dg-error "" }
+
+private:
+  typedef A<> f0; 
+  int f1;
+};
+
+template < typename = S, typename = S > 
+class B
+{
+}; 
+
+template < typename T1, typename T2 > 
+B < T1, T2 > &operator<< (B < T1, T2 >&, const int) 
+{
+  A<> (); 
+}
+
+template 
+B < S, S > &operator<< (B < S, S >&, const int);