--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp0x/variadic114.C	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,27 @@
+// PR c++/49785
+// { dg-do compile { target c++11 } }
+
+template <typename, typename ...> struct B { };
+template <typename> class A;
+
+template <typename R, typename ... S>
+struct A <R (S ...)> : public B <R, S ...>
+{
+  struct C {};
+  template <typename D> A (D, C = C ()) { }
+  R operator () (...);
+};
+
+template <typename R, typename ... S, typename T>
+auto operator >> (A <R (S ...)>, T)->A <R (S ...)>
+{
+  []() {};
+}
+
+int
+main ()
+{
+  A <int (int, int)> a = [](int, int) {};
+  auto b = []{};
+  (a >> b) (3, 5);
+}