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// RUN: %clang_cc1 -verify -fsyntax-only %s
__attribute__((objc_runtime_visible))
@interface A
@end
@interface A(X)
@end
@implementation A(X) // expected-error{{cannot implement a category for class 'A' that is only visible via the Objective-C runtime}}
@end
@interface B : A
@end
@implementation B // expected-error{{cannot implement subclass 'B' of a superclass 'A' that is only visible via the Objective-C runtime}}
@end
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