// { dg-do run  }class A;typedef int (A::*f_ptr) (void);class B {public:  B() {}; ~B() {};  B& dummy(f_ptr cb) { return *this; };};template<class SP, class CB> SP& call_dummy(SP* sp, CB cb) {  sp->dummy(cb);  return *sp;}class A {public:  A() {}; ~A() {};  int ok() { return 0; };  A& call_it(B* s) {    call_dummy(s, &A::ok);    return *this;  };};int main() {  A a; B b;  a.call_it(&b);  return 0;}