gcc/testsuite/g++.dg/template/incomplete8.C

// PR c++/71193
// { dg-options "" }

class Heap;
class A {
public:  
  Heap *m_fn1();
};
template <typename> class B : A {
  void m_fn2() { m_fn1()->HashSeed; } // { dg-warning "incomplete" }
};