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extern void objc_setForwardHandler(IMP _Nullable forward,
IMP _Nullable stretForward);
extern void objc_setEnumerationMutationHandler(
objc_enumeration_mutation_handler_t _Nullable handler);
extern id _Nullable objc_constructInstance(Class _Nullable class_,
void *_Nullable bytes);
extern void *_Nullable objc_destructInstance(id _Nullable object);
extern void *_Null_unspecified objc_autoreleasePoolPush(void);
extern void objc_autoreleasePoolPop(void *_Null_unspecified pool);
extern id _Nullable _objc_rootAutorelease(id _Nullable object);
/*
* Used by the compiler, but can also be called manually.
*
* These declarations are also required to prevent Clang's implicit
* declarations which include __declspec(dllimport) on Windows.
*/
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