gcc/testsuite/g++.dg/template/using12.C - gcc - Git at Google

 struct A {
 };

 template <typename T>
 struct S : public A {
   using A::operator(); // { dg-error "has not been declared" }
 };
	struct A {
	};

	template <typename T>
	struct S : public A {
	using A::operator(); // { dg-error "has not been declared" }
	};