anchor.diff:      logger.stdout('Migrating ${options.directory}');
       logger.stdout('');
   
  -    if (!MigrateCommand.nullSafetyOnByDefault) {
  -      logger.stdout(MigrateCommand.preFlagFlipCaveat);
  -      logger.stdout('');
  -    }
  -
       logger.stdout(MigrateCommand.migrationGuideLink);
       logger.stdout('');
   
  
positive.code:   }
  
    @override
    String get description => nullSafetyOnByDefault
        ? '$cmdDescription\n\n$migrationGuideLink'
        : '$cmdDescription\n\n$preFlagFlipCaveat\n\n$migrationGuideLink';
  
    @override
    String get invocation {
  
negative.code:   static const String migrationGuideLink =
        'See https://dart.dev/go/null-safety-migration for a migration guide.';
  
    /// Return whether the SDK has null safety on by default.
    static bool get nullSafetyOnByDefault => IsEnabledByDefault.non_nullable;
  
  