c++: Add fixed test [PR68451]

I was about to add this test with dg-ice but it turned out it had
already been fixed by the recent r11-3361!

gcc/testsuite/ChangeLog:

	PR c++/68451
	* g++.dg/cpp0x/friend6.C: New test.

diff --git a/gcc/testsuite/g++.dg/cpp0x/friend6.C b/gcc/testsuite/g++.dg/cpp0x/friend6.C
new file mode 100644 (file)
index 0000000..fce7e55
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/friend6.C
@@ -0,0 +1,23 @@
+// PR c++/68451
+// { dg-do compile { target c++11 } }
+
+struct A {};
+
+struct B
+{
+    A a;
+    friend decltype(a);
+};
+
+template <typename T>
+struct C
+{
+    A a;
+    friend decltype(a);
+};
+
+int main()
+{
+    B b;
+    C<int> c;
+}