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diff --git a/gcc/testsuite/obj-c++.dg/comp-types-7.mm b/gcc/testsuite/obj-c++.dg/comp-types-7.mm
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+/* Test assignments and comparisons involving category protocols. */
+/* Author: Nicola Pero <nicola@brainstorm.co.uk>. */
+/* { dg-do compile } */
+
+#include <objc/objc.h>
+
+@protocol MyProtocol
+- (void) method;
+@end
+
+@interface MyClass
+@end
+
+@interface MyClass (Addition) <MyProtocol>
+- (void) method;
+@end
+
+@interface MyOtherClass : MyClass
+@end
+
+int main()
+{
+ id <MyProtocol> obj_p = nil;
+ MyClass *obj_cp = nil;
+ MyOtherClass *obj_cp2 = nil;
+
+ obj_cp = obj_p; /* { dg-warning "distinct Objective\\-C type" } */
+ obj_cp2 = obj_p; /* { dg-warning "distinct Objective\\-C type" } */
+ obj_p = obj_cp; /* Ok */
+ obj_p = obj_cp2; /* Ok */
+
+ if (obj_cp == obj_p) ; /* Ok */
+ if (obj_cp2 == obj_p) ; /* Ok */
+ if (obj_p == obj_cp) ; /* Ok */
+ if (obj_p == obj_cp2) ; /* Ok */
+
+ return 0;
+}