anchor.diff:      var sdk = new FolderBasedDartSdk(
           resourceProvider, resourceProvider.getFolder(cli_util.getSdkPath()));
       var uriResolver = new DartUriResolver(sdk);
  -    return new AnalyzerResolvers._(new AnalyzerResolver(uriResolver,
  -        options: new AnalysisOptionsImpl()..strongMode = true));
  +    return new AnalyzerResolvers._(new AnalyzerResolver(uriResolver));
     }
   
     @override
  
positive.code:   /// Completer for wrapping up the current phase.
    Completer _currentPhaseComplete;
  
    AnalyzerResolver(DartUriResolver dartUriResolver, {AnalysisOptions options}) {
      options ??= new AnalysisOptionsImpl()
        ..preserveComments = false
        ..analyzeFunctionBodies = true;
      _context.analysisOptions = options;
      _context.sourceFactory =
          new SourceFactory([dartUriResolver, new _AssetUriResolver(this)]);
    }
  
negative.code: import 'package:analyzer/dart/element/element.dart';
  import 'package:analyzer/file_system/physical_file_system.dart';
  import 'package:analyzer/src/dart/sdk/sdk.dart';
  import 'package:analyzer/src/generated/engine.dart';
  import 'package:analyzer/src/generated/source.dart';
  import 'package:build/build.dart';
  import 'package:cli_util/cli_util.dart' as cli_util;
  