only in patch2:
unchanged:
--- a/core/lib/Drupal/Core/Entity/RevisionableInterface.php
+++ b/core/lib/Drupal/Core/Entity/RevisionableInterface.php
@@ -25,10 +25,13 @@ public function isNewRevision();
   /**
    * Enforces an entity to be saved as a new revision.
    *
+   * A \LogicException is thrown if the entity does not support revisions.
+   *
    * @param bool $value
    *   (optional) Whether a new revision should be saved.
    *
    * @see \Drupal\Core\Entity\EntityInterface::isNewRevision()
+   * @throws \LogicException
    */
   public function setNewRevision($value = TRUE);