anchor.diff:  import 'package:analyzer/src/generated/sdk.dart';
   import 'package:analyzer/src/generated/sdk_io.dart';
   import 'package:args/args.dart';
  -import 'package:logging/logging.dart';
   
   /**
    * The [Driver] class represents a single running instance of the analysis
  
positive.code:   static const BINARY_NAME = 'server';
  
    /**
     * The name of the option used to print usage information.
     */
    static const String HELP_OPTION = "help";
  
    /**
     * The name of the option used to specify the port to which the server will
     * connect.
     */
    static const String PORT_OPTION = "port";
  
    /**
     * The name of the option used to specify the log file.
     */
    static const String LOG_FILE_OPTION = "log";
  
    /**
     * The path to the SDK.
  
negative.code:    */
    void start(List<String> args) {
      ArgParser parser = new ArgParser();
      parser.addFlag(ENABLE_INSTRUMENTATION_OPTION,
          help: "enable sending instrumentation information to a server",
          defaultsTo: false,
          negatable: false);
      parser.addFlag(HELP_OPTION,
          help: "print this help message without starting a server",
          defaultsTo: false,
          negatable: false);
      parser.addOption(INSTRUMENTATION_LOG_FILE_OPTION,
          help: "[path] the file to which instrumentation data will be logged");
      parser.addOption(PORT_OPTION,
          help: "[port] the port on which the server will listen");
      parser.addOption(SDK_OPTION,
          help: "[path] the path to the sdk");
  
      ArgResults results = parser.parse(args);
      if (results[HELP_OPTION]) {
        _printUsage(parser);
        return;
      }
      if (results[ENABLE_INSTRUMENTATION_OPTION]) {
        if (results[INSTRUMENTATION_LOG_FILE_OPTION] != null) {
          // TODO(brianwilkerson) Initialize the instrumentation system with logging.
        } else {
          // TODO(brianwilkerson) Initialize the instrumentation system without logging.
        }
      }
      int port;
  