anchor.diff:    Future computeCompletionMetrics() async {
       int includedCount = 0;
       int notIncludedCount = 0;
  +    var completionMissedTokenCounter = Counter('missing completion counter');
       var completionKindCounter = Counter('completion kind counter');
       var completionElementKindCounter =
           Counter('completion element kind counter');
  
positive.code:     final percentIncluded = includedCount / totalCompletionCount;
      final percentNotIncluded = 1 - percentIncluded;
  
      completionKindCounter.printCounterValues();
      print('');
  
  
negative.code:               } else {
                  notIncludedCount++;
  
                  completionMissedTokenCounter
                      .count(expectedCompletion.completion);
                  completionKindCounter.count(expectedCompletion.kind.toString());
                  completionElementKindCounter
                      .count(expectedCompletion.elementKind.toString());
  