6 enum X { A,B,C};
7 int f(enum X x) {  in f()
8   return x; // unsigned-warning {{implicit conversion changes signedness: 'enum X' to 'int'}}  in f()
11 enum SE1 { N1 = -1 }; // Always a signed underlying type.
12 enum E1 { P1 };       // Unsigned underlying type except on Windows.
14 // ensure no regression with enum to sign (related to enum-enum-conversion.c)
15 int f1(enum E1 E) {  in f1()
16   return E; // unsigned-warning {{implicit conversion changes signedness: 'enum E1' to 'int'}}  in f1()
19 enum E1 f2(int E) {  in f2()
20   return E; // unsigned-warning {{implicit conversion changes signedness: 'int' to 'enum E1'}}  in f2()
23 int f3(enum SE1 E) {  in f3()
27 enum SE1 f4(int E) {  in f4()
31 unsigned f5(enum E1 E) {  in f5()
32   return E; // win32-warning {{implicit conversion changes signedness: 'enum E1' to 'unsigned int'}}  in f5()
35 enum E1 f6(unsigned E) {  in f6()
36   return E; // win32-warning {{implicit conversion changes signedness: 'unsigned int' to 'enum E1'}}  in f6()
39 unsigned f7(enum SE1 E) {  in f7()
40   return E; // both-warning {{implicit conversion changes signedness: 'enum SE1' to 'unsigned int'}}  in f7()
43 enum SE1 f8(unsigned E) {  in f8()
44   return E; // both-warning {{implicit conversion changes signedness: 'unsigned int' to 'enum SE1'}}  in f8()