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#if __has_attribute(__objc_designated_initializer__)
# define OF_DESIGNATED_INITIALIZER \
__attribute__((__objc_designated_initializer__))
#else
# define OF_DESIGNATED_INITIALIZER
#endif
#if __has_attribute(__objc_boxable__)
# define OF_BOXABLE __attribute__((__objc_boxable__))
#else
# define OF_BOXABLE
#endif
#if __has_attribute(__swift_name__)
# define OF_SWIFT_NAME(name) __attribute__((__swift_name__(name)))
#else
# define OF_SWIFT_NAME(name)
#endif
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