anchor.diff:        return;
       }
   
  -    var changes = <SourceChange>[];
       //
       // Allow plugins to start computing assists.
       //
  
positive.code:     return errorFixesList;
    }
  
    /// Compute and return the fixes associated with server-generated errors.
    Future<List<AnalysisErrorFixes>> _computeServerErrorFixes(
        Request request, String file, int offset) async {
  
negative.code:     pluginChanges
          .sort((first, second) => first.priority.compareTo(second.priority));
      changes.addAll(pluginChanges.map(converter.convertPrioritizedSourceChange));
  
      //
      // Send the response.
      //
  