1/* Contributed by Nicola Pero <nicola.pero@meta-innovation.com>, December 2010.  */
2/* { dg-do compile } */
3
4#include <objc/objc.h>
5
6/* Test that the compiler can correctly compare protocols in types of
7   method signatures.  In this test we look at protocols implementing
8   other protocols.  The fact that one protocol implements another one
9   doesn't mean that they are identical.  */
10
11@protocol A
12- (void) doSomething;
13@end
14
15@protocol B <A>
16- (void) doSomethingElse;
17@end
18
19@protocol C <A>
20- (void) doYetSomethingElse;
21@end
22
23@interface MyClass2
24- (void) aMethod: (id <A>)x;  /* { dg-message "previous declaration" } */
25- (void) aMethod: (id <B>)x;  /* { dg-error "duplicate declaration" } */
26
27- (void) bMethod: (id <B>)x;  /* { dg-message "previous declaration" } */
28- (void) bMethod: (id <A>)x;  /* { dg-error "duplicate declaration" } */
29
30- (void) cMethod: (id <A, B>)x;
31- (void) cMethod: (id <B>)x;  /* Ok - because if you implement B, then you also implement A, so <B> == <A, B> */
32
33- (void) dMethod: (id <A, B>)x;
34- (void) dMethod: (id <B, A>)x; /* Ok */
35
36- (void) eMethod: (id <A>)x;    /* { dg-message "previous declaration" } */
37- (void) eMethod: (id <B, C>)x; /* { dg-error "duplicate declaration" } */
38
39- (void) fMethod: (id <B, C>)x;    /* { dg-message "previous declaration" } */
40- (void) fMethod: (id <A>)x;       /* { dg-error "duplicate declaration" } */
41
42- (void) gMethod: (id <A>)x;       /* { dg-message "previous declaration" } */
43- (void) gMethod: (id <A, B, C>)x; /* { dg-error "duplicate declaration" } */
44
45- (void) hMethod: (id <A, B, C>)x; /* { dg-message "previous declaration" } */
46- (void) hMethod: (id <A>)x;       /* { dg-error "duplicate declaration" } */
47@end
48