| // RUN: %clang_cc1 -fsyntax-only -verify %s | |
| @interface MessageStore | |
| @property (assign, readonly) int P; | |
| @end | |
| @interface MessageStore (CAT) | |
| @property (assign) int P; | |
| @end | |
| @interface NeXTMbox : MessageStore | |
| @end | |
| @implementation NeXTMbox | |
| - (void) Meth { self.P = 1; } | |
| @end | |