12 template <class T> typename remove_reference<T>::type &&move(T &&t);
24   return std::move(b1);  in test1()
25   return std::move(b2);  in test1()
42   return std::move(a1);  in test2()
43   return std::move(a2);  in test2()
44   return std::move(b1);  in test2()
45   return std::move(b2);  in test2()
53   return std::move(b1);  in test3()
54   return std::move(b2);  in test3()
66   return std::move(a1);  in test4()
67   return std::move(a2);  in test4()
68   return std::move(b1);  in test4()
69   return std::move(b2);  in test4()
82   return std::move(d);  in test5()
96     return std::move(a);  in test1()
110     return std::move(t);  in test2()