1#pragma clang system_header 2 3#define nil 0 4#define BOOL int 5 6#define NS_ASSUME_NONNULL_BEGIN _Pragma("clang assume_nonnull begin") 7#define NS_ASSUME_NONNULL_END _Pragma("clang assume_nonnull end") 8 9NS_ASSUME_NONNULL_BEGIN 10 11typedef struct _NSZone NSZone; 12 13@protocol NSObject 14+ (instancetype)alloc; 15- (instancetype)init; 16- (instancetype)autorelease; 17@end 18 19@protocol NSCopying 20- (id)copyWithZone:(nullable NSZone *)zone; 21@end 22 23@protocol NSMutableCopying 24- (id)mutableCopyWithZone:(nullable NSZone *)zone; 25@end 26 27__attribute__((objc_root_class)) 28@interface 29NSObject<NSObject> 30@end 31 32@interface NSString : NSObject<NSCopying> 33- (BOOL)isEqualToString : (NSString *)aString; 34- (NSString *)stringByAppendingString:(NSString *)aString; 35@end 36 37void NSSystemFunctionTakingNonnull(NSString *s); 38 39@interface NSSystemClass : NSObject 40- (void) takesNonnull:(NSString *)s; 41@end 42 43NS_ASSUME_NONNULL_END 44