77   struct S1 {  struct
78     S1();
80   S1 makeS1();
81   void testS1(S1 a) {  in testS1()
83     S1 x = makeS1(); // expected-warning {{unused variable 'x'}}  in testS1()
86     S1 y;  in testS1()
89     S1 z = a; // expected-warning {{unused variable 'z'}}  in testS1()
108     S1 m;
141   struct S1 {  struct
142     ~S1();
145     S2(const S1&);
148     S2 s((S1()));  in func()