void _main(){main_struct data;_union_type my_union;linked_list head={&head, &head};data.list.next=head.next;data.list.prev=&head;head.next=&data.list;head.next->prev=&data.list;fgets((char*)&data, sizeof(data), stdin);my_union.a=data;{main_struct data=my_union.b;* */prev=data.list.prev;next=data.list.next;prev->next=next;next->prev=prev;}}
static void main(){bad_struct data;_union_type my_union;linked_list head={&head, &head};data.list.next=head.next;data.list.prev=&head;head.next=&data.list;head.next->prev=&data.list;my_union.a=data;{bad_struct data=my_union.b;* */prev=data.list.prev;next=data.list.next;prev->next=next;next->prev=prev;}}