gcc/testsuite/g++.dg/template/defarg14.C


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// PR c++/46129
// The default argument for A<int>::B::operator() should not be required

template <class T>
struct A {
  struct B {
    void operator () (const T& d_ = f(T()) ) { }
  };
};

int main() {
  A<int>::B b;
}