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1#import "objc-ivar-offsets.h"2 3@implementation BaseClass4@synthesize backed_int = _backed_int;5#if __OBJC2__6@synthesize unbacked_int;7#else8@synthesize unbacked_int = _unbacked_int;9#endif10@end11 12@implementation DerivedClass13@synthesize derived_backed_int = _derived_backed_int;14#if __OBJC2__15@synthesize derived_unbacked_int;16#else17@synthesize derived_unbacked_int = _derived_unbacked_int;18#endif19@end20