sclass IntRange {
  int start, end;
  
  *() {}
  *(int *start, int *end) {}
  
  [stdEq]
  
  final int length() { ret end-start; }
  final bool empty() { ret start >= end; }
  
  sS _fieldOrder = "start end";
  
  toString { ret "[" + start + ";" + end + "]"; }
}