public WidgetBaseInterface::flagErrors(FieldItemListInterface $items, ConstraintViolationListInterface $violations, array $form, FormStateInterface $form_state)
Reports field-level validation errors against actual form elements.
\Drupal\Core\Field\FieldItemListInterface $items: The field values.
\Symfony\Component\Validator\ConstraintViolationListInterface $violations: A list of constraint violations to flag.
array $form: The form structure where field elements are attached to. This might be a full form structure, or a sub-element of a larger form.
\Drupal\Core\Form\FormStateInterface $form_state: The form state.
public function flagErrors(FieldItemListInterface $items, ConstraintViolationListInterface $violations, array $form, FormStateInterface $form_state);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!WidgetBaseInterface.php/function/WidgetBaseInterface::flagErrors/8.1.x