1extern "C" void abort(); 2 3struct S1 4{ 5 int f() { return 0; } 6 int f() const { return 1; } 7}; 8 9struct S2 : public S1 10{ 11}; 12 13int main() 14{ 15 S2 s2; 16 if (s2.f() != 0) 17 abort (); 18} 19