anchor.diff:    }
   
     Future getFixes(Request request) async {
  -    var params = new EditGetFixesParams.fromRequest(request);
  +    EditGetFixesParams params = new EditGetFixesParams.fromRequest(request);
       String file = params.file;
       int offset = params.offset;
  -
  -    List<AnalysisErrorFixes> errorFixesList = <AnalysisErrorFixes>[];
       //
       // Allow plugins to start computing fixes.
       //
  
positive.code:     //
      // Compute fixes associated with server-generated errors.
      //
      AnalysisResult result = await server.getAnalysisResult(file);
      if (result != null) {
        CompilationUnit unit = result.unit;
        LineInfo lineInfo = result.lineInfo;
        int requestLine = lineInfo.getLocation(offset).lineNumber;
        for (engine.AnalysisError error in result.errors) {
          int errorLine = lineInfo.getLocation(error.offset).lineNumber;
          if (errorLine == requestLine) {
            var context = new _DartFixContextImpl(server.resourceProvider,
                result.driver, new AstProviderForDriver(driver), unit, error);
            List<Fix> fixes =
                await new DefaultFixContributor().internalComputeFixes(context);
            if (fixes.isNotEmpty) {
              fixes.sort(Fix.SORT_BY_RELEVANCE);
              AnalysisError serverError =
                  newAnalysisError_fromEngine(lineInfo, error);
              AnalysisErrorFixes errorFixes = new AnalysisErrorFixes(serverError);
              errorFixesList.add(errorFixes);
              fixes.forEach((fix) {
                errorFixes.fixes.add(fix.change);
              });
            }
          }
        }
      }
      //
  
negative.code: 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/session.dart';
  import 'package:analyzer/dart/ast/ast.dart';
  import 'package:analyzer/dart/ast/standard_resolution_map.dart';
  import 'package:analyzer/dart/element/element.dart';
  