// prms-id: 6610int fail = 1;struct B;struct A { virtual int f(const B*) = 0; int g(const B*); };int A::g(const B* t) { return f(t); }struct B : virtual A { int f(const B*); B* B_this; };int B::f(const B* t) { return t == this; }struct S1 { };struct C : virtual S1, virtual B, virtual A { C(); };C::C() { if (g(this)) fail = 0; }struct D : virtual B, virtual A, C { };int main() { D d; return fail; }