Objective-C watchOS 5.2 to 6.0 API Differences

message.h
Declaration
Fromid objc_msgSend(id self, SEL op, ...)
Tovoid objc_msgSend(void)

Declaration
Fromid objc_msgSendSuper(struct objc_super *super, SEL op, ...)
Tovoid objc_msgSendSuper(void)

Declaration
Fromid method_invoke(id receiver, Method m, ...)
Tovoid method_invoke(void)

objc.h
Modified IMP
Declaration
Fromtypedef id (*IMP)(id, SEL, ...)
Totypedef void (*IMP)()

runtime.h