1 // PR c++/46129 2 // The default argument for A<int>::B::operator() should not be required 3 4 template <class T> 5 struct A { 6 struct B { operatorA::B7 void operator () (const T& d_ = f(T()) ) { } 8 }; 9 }; 10 main()11 int main() { 12 A<int>::B b; 13 } 14