anchor.diff:        this.useColors: true,
         this.help: false,
         this.version: false,
  -      this.logLevel: Level.SEVERE,
  +      this.logLevel: Level.WARNING,
         this.serverMode: false,
         this.enableHashing: false,
         this.widget: true,
  
positive.code:   if (enableHashing == null) {
      enableHashing = serverMode;
    }
    // TODO(jmesserly): shouldn't level always default to warning?
    var logLevel = serverMode ? Level.WARNING : Level.SEVERE;
    var levelName = args['log'];
    if (levelName != null) {
      levelName = levelName.toUpperCase();
  
negative.code:       defaultsTo: _CLOSURE_DEFAULT)
    ..addFlag('force-compile',
        help: 'Compile code with static errors', defaultsTo: false)
    ..addOption('log', abbr: 'l', help: 'Logging level (defaults to warning)')
    ..addFlag('dump-info',
        abbr: 'i', help: 'Dump summary information', defaultsTo: null)
    ..addOption('v8-binary',
  