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// RUN: clang -cc1 -fsyntax-only -verify %s
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@interface MessageStore
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@property (assign, readonly) int P;
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@end
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@interface MessageStore (CAT)
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@property (assign) int P;
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@end
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@interface NeXTMbox : MessageStore
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@end
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@implementation NeXTMbox
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- (void) Meth { self.P = 1; }
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@end
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