21   B b2;  in test1()  local
23   return b2;  in test1()
25   return std::move(b2);  in test1()
35   B b2;  in test2()  local
40   return b2;  in test2()
45   return std::move(b2);  in test2()
50   B& b2 = b1;  in test3()  local
52   return b2;  in test3()
54   return std::move(b2);  in test3()
59   B& b2 = b1;  in test4()  local
64   return b2;  in test4()
69   return std::move(b2);  in test4()