anchor.diff:  
     Future<AnalysisResults> analyzeMulti(Map<String, String> sources) {
       try {
  -      String pathPrefix = Directory.current.path;
  +      String pathPrefix = _sourceDirectory.path;
         List<StringSource> sourcesList = <StringSource>[];
         for (String name in sources.keys) {
           String path = name.startsWith('/') ? name : '$pathPrefix/$name';
  
positive.code:   AnalysisContext _context;
    // MemoryResolver _resolver;
    String _sdkPath;
  
    ContentCache cache;
  
  
negative.code:     //   return _resolver;
      // };
      
      _context = builder.buildContext(_sourceDirectory.path);
  
  
      // _context.analysisOptions = options;
  