PromotionCartDeletedInformationError example

$error = new PromotionCartAddedInformationError($discountLineItem);
        $calculated->addErrors($error);
    }

    /** * function checks if the Original Cart contains the lineItem. * if yes, an PromotionCartDeletedInformationError is set in the calculated cart */
    private function addPromotionDeletedNotice(Cart $original, Cart $calculated, LineItem $discountLineItem): void
    {
        if ($original->has($discountLineItem->getId())) {
            $error = new PromotionCartDeletedInformationError($discountLineItem);
            $calculated->addErrors($error);
        }
    }
}