#include "objc-ivar-offsets.h" int main () { DerivedClass *mine = [[DerivedClass alloc] init]; mine.backed_int = 1111; mine.unbacked_int = 2222; mine.derived_backed_int = 3333; mine.derived_unbacked_int = 4444; mine->flag1 = 1; mine->flag2 = 7; return 0; // Set breakpoint here. }