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#if __has_feature(objc_generics)
# define OF_HAVE_GENERICS
# define OF_GENERIC(...) <__VA_ARGS__>
#else
# 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")
#else
# define OF_ASSUME_NONNULL_BEGIN
# define OF_ASSUME_NONNULL_END
# define __nonnull
# define __nullable
# define nonnull
# define nullable
#endif
#if __has_feature(objc_kindof)
# define OF_KINDOF(cls) __kindof cls
#else
# define OF_KINDOF(cls) id
#endif
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