- drupal_set_message(t('The block %info was assigned to the invalid region %region and has been disabled.', ['%info' => $block_id, '%region' => $block->getRegion()]), 'warning');
+ \Drupal::messenger()
+ ->addWarning(t('The block %info was assigned to the invalid region %region and has been disabled.', [
+ '%info' => $block_id,
+ '%region' => $block->getRegion(),
+ ]));