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diff --git a/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRebuildPreserveValuesForm.php b/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRebuildPreserveValuesForm.php
index 58934a781..b1054abf0 100644
--- a/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRebuildPreserveValuesForm.php
+++ b/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRebuildPreserveValuesForm.php
@@ -7,6 +7,8 @@ use Drupal\Core\Form\FormStateInterface;
 
 /**
  * Form builder for testing preservation of values during a rebuild.
+ *
+ * @internal
  */
 class FormTestRebuildPreserveValuesForm extends FormBase {
 
@@ -92,7 +94,7 @@ class FormTestRebuildPreserveValuesForm extends FormBase {
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
     // Finish the workflow. Do not rebuild.
-    drupal_set_message(t('Form values: %values', ['%values' => var_export($form_state->getValues(), TRUE)]));
+    $this->messenger()->addStatus($this->t('Form values: %values', ['%values' => var_export($form_state->getValues(), TRUE)]));
   }
 
 }