--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/temp_default4.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,11 @@
+// { dg-do compile { target c++11 } }
+
+class X {
+  template<typename T = int> friend void f(X) { }
+  template<typename T> friend void g(X); // { dg-message "previously declared here" }
+  template<typename T = int> friend void h(X); // { dg-error "function template friend" }
+};
+
+template<typename T = int> void g(X) // { dg-error "default template argument" }
+{
+}