Coupon.php

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<?php
namespace Magento\Checkout\Block\Cart;

class Coupon extends \Magento\Checkout\Block\Cart\AbstractCart
{
    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Checkout\Model\Session $checkoutSession,
        array $data = []
    ) {
        parent::__construct($context, $customerSession, $checkoutSession, $data);
        $this->_isScopePrivate = true;
    }

    public function getCouponCode()
    {
        return $this->getQuote()->getCouponCode();
    }
}