anchor.diff:        case CompletionGroup.typeReference:
           typeRefMrrComputer.addRank(rank);
           break;
  +      case CompletionGroup.localReference:
  +        localRefMrrComputer.addRank(rank);
  +        break;
  +
         case CompletionGroup.topLevel:
           topLevelMrrComputer.addRank(rank);
           break;
  
positive.code: 
  /// An indication of the group in which the completion falls for the purposes of
  /// subdividing the results.
  enum CompletionGroup { instanceMember, staticMember, typeReference, topLevel }
  
  /// A wrapper for the collection of [Counter] and [MeanReciprocalRankComputer]
  /// objects for a run of [CompletionMetricsComputer].
  
negative.code:           return staticMemberSlowestResults;
          case CompletionGroup.typeReference:
            return typeRefSlowestResults;
          case CompletionGroup.localReference:
            return localRefSlowestResults;
          case CompletionGroup.topLevel:
            return topLevelSlowestResults;
        }
  