void main(){twointsclass data;twointsclass &data_ref=data;{twointsclass data=data_ref;printIntLine(data.a);printIntLine(data.b);}}
static void main(){twointsclass data;twointsclass &data_ref=data;{twointsclass data=data_ref;data.a=1;data.b=2;printIntLine(data.a);printIntLine(data.b);}}