anchor.diff:    bool dart2jsHint = false;
   
     @override
  +  List<String> enabledExperiments = const <String>[];
  +
  +  @override
     List<String> enabledPluginNames = const <String>[];
   
     @override
  
positive.code:     preserveComments = true;
      strongModeHints = false;
      trackCacheDependencies = true;
      useFastaParser = false;
    }
  
    @override
    void setCrossContextOptionsFrom(AnalysisOptions options) {
      enableLazyAssignmentOperators = options.enableLazyAssignmentOperators;
  
negative.code:    */
    bool implicitDynamic = true;
  
    /**
     * Return `true` to enable mixin declarations.
     * https://github.com/dart-lang/language/issues/12
  