Expanded class hierarchy of TestLoader in Drupal 8
- class \Drupal\twig_loader_test\Loader\TestLoader implements \Drupal\twig_loader_test\Loader\Twig_LoaderInterface, \Drupal\twig_loader_test\Loader\Twig_ExistsLoaderInterface, \Drupal\twig_loader_test\Loader\Twig_SourceContextLoaderInterface