anchor.diff:  import 'package:analysis_server/src/services/correction/status.dart';
   import 'package:analysis_server/src/services/refactoring/refactoring.dart';
   import 'package:analysis_server/src/services/search/search_engine.dart';
  -import 'package:analyzer/dart/analysis/results.dart';
   import 'package:analyzer/dart/analysis/session.dart';
   import 'package:analyzer/dart/element/element.dart';
   import 'package:analyzer/error/error.dart' as engine;
  
positive.code:       if (fixes.isNotEmpty) {
          fixes.sort(Fix.SORT_BY_RELEVANCE);
          var lineInfo = LineInfo.fromContent(content);
          ResolvedUnitResult result = engine.ResolvedUnitResultImpl(session, file,
              Uri.file(file), true, content, lineInfo, false, null, errors);
          var serverError = newAnalysisError_fromEngine(result, error);
          var errorFixes = AnalysisErrorFixes(serverError);
          errorFixesList.add(errorFixes);
  
negative.code:       if (fixes.isNotEmpty) {
          fixes.sort(Fix.SORT_BY_RELEVANCE);
          var lineInfo = LineInfo.fromContent(content);
          var result = engine.ErrorsResultImpl(
              session, file, Uri.file(file), lineInfo, false, errors);
          var serverError = newAnalysisError_fromEngine(result, error);
          var errorFixes = AnalysisErrorFixes(serverError);
          errorFixesList.add(errorFixes);
  