// it's unclear whether the end is inclusive or exclusive
// (usually exclusive I guess)
sclass IntRange {
  int start, end;
  
  *() {}
  *(int *start, int *end) {}
  *(IntRange r) { start = r.start; end = r.end; }
  
  [stdEq]
  
  final int length() { ret end-start; }
  final bool empty() { ret start >= end; }
  final bool isEmpty() { ret start >= end; }
  
  sS _fieldOrder = "start end";
  
  toString { ret "[" + start + ";" + end + "]"; }
  
  bool contains(int i) { ret i >= start && i <= end; }
}

Began life as a copy of #1005873