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1// RUN: %clang_cc1 -fsyntax-only -verify %s2 3#define nil (void *)0;4 5extern void foo(void);6 7@protocol MyProtocolA8- (void) methodA;9@end10 11@protocol MyProtocolB12- (void) methodB;13@end14 15@protocol MyProtocolAB <MyProtocolA, MyProtocolB>16@end17 18@protocol MyProtocolAC <MyProtocolA>19- (void) methodC;20@end21 22int main(void)23{24 id<MyProtocolA> obj_a = nil;25 id<MyProtocolB> obj_b = nil;26 id<MyProtocolAB> obj_ab = nil;27 id<MyProtocolAC> obj_ac = nil;28 29 obj_a = obj_b; // expected-warning {{assigning to 'id<MyProtocolA>' from incompatible type 'id<MyProtocolB>'}}30 obj_a = obj_ab; /* Ok */31 obj_a = obj_ac; /* Ok */32 33 obj_b = obj_a; // expected-warning {{assigning to 'id<MyProtocolB>' from incompatible type 'id<MyProtocolA>'}}34 obj_b = obj_ab; /* Ok */35 obj_b = obj_ac; // expected-warning {{assigning to 'id<MyProtocolB>' from incompatible type 'id<MyProtocolAC>'}}36 37 obj_ab = obj_a; // expected-warning {{assigning to 'id<MyProtocolAB>' from incompatible type 'id<MyProtocolA>'}}38 obj_ab = obj_b; // expected-warning {{assigning to 'id<MyProtocolAB>' from incompatible type 'id<MyProtocolB>'}}39 obj_ab = obj_ac; // expected-warning {{assigning to 'id<MyProtocolAB>' from incompatible type 'id<MyProtocolAC>'}}40 41 obj_ac = obj_a; // expected-warning {{assigning to 'id<MyProtocolAC>' from incompatible type 'id<MyProtocolA>'}}42 obj_ac = obj_b; // expected-warning {{assigning to 'id<MyProtocolAC>' from incompatible type 'id<MyProtocolB>'}}43 obj_ac = obj_ab; // expected-warning {{assigning to 'id<MyProtocolAC>' from incompatible type 'id<MyProtocolAB>'}}44 45 if (obj_a == obj_b) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolA>' and 'id<MyProtocolB>')}}46 if (obj_b == obj_a) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolB>' and 'id<MyProtocolA>')}}47 48 if (obj_a == obj_ab) foo (); /* Ok */49 if (obj_ab == obj_a) foo (); /* Ok */ 50 51 if (obj_a == obj_ac) foo (); /* Ok */ 52 if (obj_ac == obj_a) foo (); /* Ok */ 53 54 if (obj_b == obj_ab) foo (); /* Ok */ 55 if (obj_ab == obj_b) foo (); /* Ok */ 56 57 if (obj_b == obj_ac) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolB>' and 'id<MyProtocolAC>')}} 58 if (obj_ac == obj_b) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolAC>' and 'id<MyProtocolB>')}} 59 60 if (obj_ab == obj_ac) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolAB>' and 'id<MyProtocolAC>')}} 61 if (obj_ac == obj_ab) foo (); // expected-warning {{comparison of distinct pointer types ('id<MyProtocolAC>' and 'id<MyProtocolAB>')}} 62 63 return 0;64}65