anchor.diff:  
       if (!debuggingOptions.debuggingEnabled) {
         // If debugging is not enabled, just launch the application and continue.
  -      printTrace("Debugging is not enabled");
  +      printTrace('Debugging is not enabled');
         installationResult = await runCommandAndStreamOutput(launchCommand, trace: true);
       } else {
         // Debugging is enabled, look for the observatory and diagnostic server
         // ports post launch.
  -      printTrace("Debugging is enabled, connecting to observatory and the diagnostic server");
  +      printTrace('Debugging is enabled, connecting to observatory and the diagnostic server');
   
         // TODO(danrubel): The Android device class does something similar to this code below.
         // The various Device subclasses should be refactored and common code moved into the superclass.
  
positive.code:     final IOSApp iosApp = app;
      final Directory bundle = fs.directory(iosApp.deviceBundlePath);
      if (!bundle.existsSync()) {
        printError("Could not find application bundle at ${bundle.path}; have you run 'flutter build ios'?");
        return false;
      }
  
  
negative.code:     _loggerPath = _checkForCommand('idevicesyslog');
      _screenshotPath = _checkForCommand('idevicescreenshot');
      _pusherPath = _checkForCommand(
        'ios-deploy',
        'To copy files to iOS devices, please install ios-deploy. To install, run:\n'
        'brew update\n'
        'brew install ios-deploy'
      );
    }
  
    String _installerPath;
  