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// RUN: %clang_cc1 -fsyntax-only -verify %s
#define nil (void *)0;
extern void foo();
@protocol MyProtocolA
- (void) methodA;
@end
@protocol MyProtocolB
- (void) methodB;
@end
@protocol MyProtocolAB <MyProtocolA, MyProtocolB>
@end
@protocol MyProtocolAC <MyProtocolA>
- (void) methodC;
@end
int main()
{
id<MyProtocolA> obj_a = nil;
id<MyProtocolB> obj_b = nil;
id<MyProtocolAB> obj_ab = nil;
id<MyProtocolAC> obj_ac = nil;
obj_a = obj_b; // expected-warning {{assigning to 'id<MyProtocolA>' from incompatible type 'id<MyProtocolB>'}}
obj_a = obj_ab; /* Ok */
obj_a = obj_ac; /* Ok */
obj_b = obj_a; // expected-warning {{assigning to 'id<MyProtocolB>' from incompatible type 'id<MyProtocolA>'}}
obj_b = obj_ab; /* Ok */
obj_b = obj_ac; // expected-warning {{assigning to 'id<MyProtocolB>' from incompatible type 'id<MyProtocolAC>'}}
obj_ab = obj_a; // expected-warning {{assigning to 'id<MyProtocolAB>' from incompatible type 'id<MyProtocolA>'}}
obj_ab = obj_b; // expected-warning {{assigning to 'id<MyProtocolAB>' from incompatible type 'id<MyProtocolB>'}}
obj_ab = obj_ac; // expected-warning {{assigning to 'id<MyProtocolAB>' from incompatible type 'id<MyProtocolAC>'}}
obj_ac = obj_a; // expected-warning {{assigning to 'id<MyProtocolAC>' from incompatible type 'id<MyProtocolA>'}}
obj_ac = obj_b; // expected-warning {{assigning to 'id<MyProtocolAC>' from incompatible type 'id<MyProtocolB>'}}
obj_ac = obj_ab; // expected-warning {{assigning to 'id<MyProtocolAC>' from incompatible type 'id<MyProtocolAB>'}}
if (obj_a == obj_b) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolA>' and 'id<MyProtocolB>')}}
if (obj_b == obj_a) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolB>' and 'id<MyProtocolA>')}}
if (obj_a == obj_ab) foo (); /* Ok */
if (obj_ab == obj_a) foo (); /* Ok */
if (obj_a == obj_ac) foo (); /* Ok */
if (obj_ac == obj_a) foo (); /* Ok */
if (obj_b == obj_ab) foo (); /* Ok */
if (obj_ab == obj_b) foo (); /* Ok */
if (obj_b == obj_ac) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolB>' and 'id<MyProtocolAC>')}}
if (obj_ac == obj_b) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolAC>' and 'id<MyProtocolB>')}}
if (obj_ab == obj_ac) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolAB>' and 'id<MyProtocolAC>')}}
if (obj_ac == obj_ab) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolAC>' and 'id<MyProtocolAB>')}}
return 0;
}
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