protected override void VisitUnknown(UnknownCommand item) { throw new NotImplementedException("Cannot optimize unknown instruction: " + item.Command); }
protected abstract void VisitUnknown(UnknownCommand item);
protected override void VisitUnknown(UnknownCommand item) { Console.WriteLine("Warning: unknown command {0} ({1})", item.HpglStr(), item); }
protected override void VisitUnknown(UnknownCommand item) { Unprocessed(item); }