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# define OF_GENERIC(...)
#endif
#if __has_feature(nullability)
# define OF_ASSUME_NONNULL_BEGIN _Pragma("clang assume_nonnull begin")
# define OF_ASSUME_NONNULL_END _Pragma("clang assume_nonnull end")
# define OF_NULLABLE_PROPERTY(...) (__VA_ARGS__, nullable)
# define OF_NULL_RESETTABLE_PROPERTY(...) (__VA_ARGS__, null_resettable)
#else
# define OF_ASSUME_NONNULL_BEGIN
# define OF_ASSUME_NONNULL_END
# define _Nonnull
# define _Nullable
# define _Null_unspecified
# define OF_NULLABLE_PROPERTY
# define OF_NULL_RESETTABLE_PROPERTY
# define nonnull
# define nullable
#endif
#if __has_feature(objc_kindof)
# define OF_KINDOF(cls) __kindof cls
#else
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