anchor.diff:    static const BINARY_NAME = 'dartdeps';
   
     /**
  +   * The name of the option used to specify the Dart SDK.
  +   */
  +  static const String DART_SDK_OPTION = 'dart-sdk';
  +
  +  /**
      * The name of the option used to print usage information.
      */
     static const String HELP_OPTION = 'help';
  
positive.code:    */
    Future<AnalysisManager> start() {
      var parser = new ArgParser();
      parser.addFlag(HELP_OPTION,
          help: 'print this help message without starting analysis',
          defaultsTo: false,
  
negative.code:    * The command line arguments.
     */
    final List<String> args;
  
    /**
     * The path to the Dart SDK used during analysis.
     */
    String sdkPath;
  
    /**
     * The manager for the analysis server.
  