public FormCacheInterface::deleteCache($form_build_id)
Deletes a form in the cache.
string $form_build_id: The unique form build ID.
public function deleteCache($form_build_id);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormCacheInterface.php/function/FormCacheInterface::deleteCache/8.1.x