Locale.php

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<?php
namespace Magento\Config\Model\Config\Backend;

use Magento\Framework\App\Config\ScopeConfigInterface;

class Locale extends \Magento\Framework\App\Config\Value
{
    protected $_configsFactory;

    protected $_websiteFactory;

    protected $_storeFactory;

    protected $_localeCurrency;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Config\ScopeConfigInterface $config,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Config\Model\ResourceModel\Config\Data\CollectionFactory $configsFactory,
        \Magento\Store\Model\WebsiteFactory $websiteFactory,
        \Magento\Store\Model\StoreFactory $storeFactory,
        \Magento\Framework\Locale\CurrencyInterface $localeCurrency,
        \Magento\Framework\Model\ResourceModel\AbstractResource $resource = null,
        \Magento\Framework\Data\Collection\AbstractDb $resourceCollection = null,
        array $data = []
    ) {
        $this->_configsFactory = $configsFactory;
        $this->_websiteFactory = $websiteFactory;
        $this->_storeFactory = $storeFactory;
        $this->_localeCurrency = $localeCurrency;
        parent::__construct($context, $registry, $config, $cacheTypeList, $resource, $resourceCollection, $data);
    }

    public function afterSave()
    {
        $collection = $this->_configsFactory->create();
        $collection->addPathFilter('currency/options');

        $values = explode(',', $this->getValue());
        $exceptions = [];

        foreach ($collection as $data) {
            $match = false;
            $scopeName = __('Default scope');

            if (preg_match('/(base|default)$/', $data->getPath(), $match)) {
                if (!in_array($data->getValue(), $values)) {
                    $currencyName = $this->_localeCurrency->getCurrency($data->getValue())->getName();
                    if ($match[1] == 'base') {
                        $fieldName = __('Base currency');
                    } else {
                        $fieldName = __('Display default currency');
                    }

                    switch ($data->getScope()) {
                        case ScopeConfigInterface::SCOPE_TYPE_DEFAULT:
                            $scopeName = __('Default scope');
                            break;

                        case \Magento\Store\Model\ScopeInterface::SCOPE_WEBSITE:
                            $website = $this->_websiteFactory->create();
                            $websiteName = $website->load($data->getScopeId())->getName();
                            $scopeName = __('website(%1) scope', $websiteName);
                            break;

                        case \Magento\Store\Model\ScopeInterface::SCOPE_STORE:
                            $store = $this->_storeFactory->create();
                            $storeName = $store->load($data->getScopeId())->getName();
                            $scopeName = __('store(%1) scope', $storeName);
                            break;
                    }

                    $exceptions[] = __('Currency "%1" is used as %2 in %3.', $currencyName, $fieldName, $scopeName);
                }
            }
        }
        if ($exceptions) {
            throw new \Magento\Framework\Exception\LocalizedException(__(join("\n", $exceptions)));
        }

        return parent::afterSave();
    }
}