1 // { dg-options -std=c++17 }
2 
3 struct derived;
4 struct base {
5   friend struct derived;
6 private:
7   base();
8 };
9 struct derived : base {};
10 
11 derived d1{};			// { dg-error "" "" { target c++17 } }
12 derived d2;			// still OK
13