Expanded class hierarchy of UserMailRequired in Drupal 8
- class \Drupal\user\Plugin\Validation\Constraint\UserMailRequired extends \Symfony\Component\Validator\Constraint
- class \Drupal\administerusersbyrole\Constraint\OverrideUserMailRequired
- class \Drupal\administerusersbyrole\Constraint\OverrideUserMailRequired