public FieldItemListInterface::defaultValuesFormValidate(array $element, array &$form, FormStateInterface $form_state)
Validates the submitted default value.
Invoked from \Drupal\field_ui\Form\FieldConfigEditForm to allow administrators to configure instance-level default value.
array $element: The default value form element.
array $form: The form where the settings form is being included in.
\Drupal\Core\Form\FormStateInterface $form_state: The form state of the (entire) configuration form.
public function defaultValuesFormValidate(array $element, array &$form, FormStateInterface $form_state);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Field!FieldItemListInterface.php/function/FieldItemListInterface::defaultValuesFormValidate/8.1.x