Testcase from PR #3351

From-SVN: r44821

gcc/testsuite/g++.dg/template/friend.C

+// Contribued by Gabriel Dos Reis <gdr@codesourcery.com>
+// Origin: iskey@i100.ryd.student.liu.se
+// { dg-do link }
+
+#include <iostream>
+using namespace std;
+
+template <class T> struct s;
+
+template <class T>
+ostream& operator<<(ostream &o, const typename s<T>::t &x)
+{
+  return o;
+}
+
+template <class T>
+struct s {
+  struct t
+  {
+    friend ostream&
+    operator<<<T>(ostream&, const typename s<T>::t &);
+  };
+  t x;
+};
+
+int main()
+{
+  s<int>::t y;
+  cout << y;
+}