UserMailUnique
- class \Drupal\Core\Validation\Plugin\Validation\Constraint\UniqueFieldConstraint implements \Symfony\Component\Validator\Constraint
- class \Drupal\file\Plugin\Validation\Constraint\FileUriUnique implements \Drupal\Core\Validation\Plugin\Validation\Constraint\UniqueFieldConstraint
- class \Drupal\user\Plugin\Validation\Constraint\UserMailUnique implements \Drupal\Core\Validation\Plugin\Validation\Constraint\UniqueFieldConstraint
- class \Drupal\user\Plugin\Validation\Constraint\UserNameUnique implements \Drupal\Core\Validation\Plugin\Validation\Constraint\UniqueFieldConstraint
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