code: public function run()
      {
          // Boot the application.
          if (false === $this->boot()) {
              exit(1);
          }
  
          // Let symfony/console do the rest.
          $this->runner->run($this->request, $this->response);
          return $this;
      }
docs: Run application.
  
  @return In2pire\Cli\ApplicationInterface.
  The called object.