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#if !__has_feature(nullability)
# ifndef _Nonnull
# define _Nonnull
# endif
# ifndef _Nullable
# define _Nullable
# endif
#endif
#if !__has_feature(objc_arc) && !defined(__unsafe_unretained)
# define __unsafe_unretained
#endif
#define Nil (Class _Null_unspecified)0
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>
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#if !__has_feature(nullability)
# ifndef _Nonnull
# define _Nonnull
# endif
# ifndef _Nullable
# define _Nullable
# endif
# ifndef _Null_unspecified
# define _Null_unspecified
# endif
#endif
#if !__has_feature(objc_arc) && !defined(__unsafe_unretained)
# define __unsafe_unretained
#endif
#define Nil (Class _Null_unspecified)0
|