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+/* Contributed by Nicola Pero <nicola.pero@meta-innovation.com>, December 2010. */
+/* { dg-do compile } */
+
+#include <objc/objc.h>
+
+/* Test that the compiler can correctly compare protocols in types of
+ method signatures. In this test we look at protocols implementing
+ other protocols. The fact that one protocol implements another one
+ doesn't mean that they are identical. */
+
+@protocol A
+- (void) doSomething;
+@end
+
+@protocol B <A>
+- (void) doSomethingElse;
+@end
+
+@protocol C <A>
+- (void) doYetSomethingElse;
+@end
+
+@interface MyClass2
+- (void) aMethod: (id <A>)x; /* { dg-message "previous declaration" } */
+- (void) aMethod: (id <B>)x; /* { dg-error "duplicate declaration" } */
+
+- (void) bMethod: (id <B>)x; /* { dg-message "previous declaration" } */
+- (void) bMethod: (id <A>)x; /* { dg-error "duplicate declaration" } */
+
+- (void) cMethod: (id <A, B>)x;
+- (void) cMethod: (id <B>)x; /* Ok - because if you implement B, then you also implement A, so <B> == <A, B> */
+
+- (void) dMethod: (id <A, B>)x;
+- (void) dMethod: (id <B, A>)x; /* Ok */
+
+- (void) eMethod: (id <A>)x; /* { dg-message "previous declaration" } */
+- (void) eMethod: (id <B, C>)x; /* { dg-error "duplicate declaration" } */
+
+- (void) fMethod: (id <B, C>)x; /* { dg-message "previous declaration" } */
+- (void) fMethod: (id <A>)x; /* { dg-error "duplicate declaration" } */
+
+- (void) gMethod: (id <A>)x; /* { dg-message "previous declaration" } */
+- (void) gMethod: (id <A, B, C>)x; /* { dg-error "duplicate declaration" } */
+
+- (void) hMethod: (id <A, B, C>)x; /* { dg-message "previous declaration" } */
+- (void) hMethod: (id <A>)x; /* { dg-error "duplicate declaration" } */
+@end