anchor.diff:            return typeRefSlowestResults;
           case CompletionGroup.localReference:
             return localRefSlowestResults;
  +        case CompletionGroup.paramReference:
  +          return paramRefSlowestResults;
           case CompletionGroup.topLevel:
             return topLevelSlowestResults;
         }
  
positive.code:   /// A list of the top [maxSlowestResults] completion results that took the
    /// longest top compute for local references.
    List<CompletionResult> localRefSlowestResults = [];
  
    /// A list of the top [maxSlowestResults] completion results that took the
    /// longest top compute for top-level declarations.
  
negative.code:       case CompletionGroup.localReference:
          localRefMrrComputer.addRank(rank);
          break;
        case CompletionGroup.paramReference:
          paramRefMrrComputer.addRank(rank);
          break;
        case CompletionGroup.topLevel:
          topLevelMrrComputer.addRank(rank);
          break;
  