void main(){twointsclass * data;data=NULL;data=new twointsclass;delete data;{twointsclass * data_copy=data;twointsclass * data=data_copy;delete data;}}
static void main(){twointsclass * data;data=NULL;data=new twointsclass;{twointsclass * data_copy=data;twointsclass * data=data_copy;delete data;}}