anchor.diff:  
       includedCount = 0;
       notIncludedCount = 0;
  +    completionMissedTokenCounter.clear();
       completionKindCounter.clear();
       completionElementKindCounter.clear();
       mRRComputer.clear();
  
positive.code:   Future computeCompletionMetrics() async {
      int includedCount = 0;
      int notIncludedCount = 0;
      var completionKindCounter = Counter('completion kind counter');
      var completionElementKindCounter =
          Counter('completion element kind counter');
  
negative.code:               } else {
                  notIncludedCount++;
  
                  completionMissedTokenCounter
                      .count(expectedCompletion.completion);
                  completionKindCounter.count(expectedCompletion.kind.toString());
                  completionElementKindCounter
                      .count(expectedCompletion.elementKind.toString());
  