20 A test1(B b1) {  in test1()  argument
22   return b1;  in test1()
24   return std::move(b1);  in test1()
33 C test2(A a1, B b1) {  in test2()  argument
39   return b1;  in test2()
44   return std::move(b1);  in test2()
49 A test3(B& b1) {  in test3()  argument
50   B& b2 = b1;  in test3()
51   return b1;  in test3()
53   return std::move(b1);  in test3()
57 C test4(A& a1, B& b1) {  in test4()  argument
59   B& b2 = b1;  in test4()
63   return b1;  in test4()
68   return std::move(b1);  in test4()