gcc/testsuite/g++.dg/cpp1z/aggr-base2a.C

   1 // { dg-do compile { target c++11 } }
   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