Similar to self::$build_info, but pertaining to \Drupal\Core\Form\FormBuilderInterface::rebuildForm().
This property is uncacheable.
Type: array
protected $rebuild_info = array();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/property/FormState::rebuild_info/8.1.x