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final sclass DoubleRange {
  gettable double start;
  gettable double end;
  
  *() {}
  *(double *start, double *end) {}
  
  [stdEq]
  
  double length() { ret end-start; }
  
  sS _fieldOrder = "start end";
  
  toString { ret "[" + start + ";" + end + "]"; }
}