Currency.php

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<?php
namespace Magento\Config\Model\Config\Source\Locale;

class Currency implements \Magento\Framework\Option\ArrayInterface
{
    protected $_options;

    protected $_localeLists;

    public function __construct(\Magento\Framework\Locale\ListsInterface $localeLists)
    {
        $this->_localeLists = $localeLists;
    }

    public function toOptionArray()
    {
        if (!$this->_options) {
            $this->_options = $this->_localeLists->getOptionCurrencies();
        }
        $options = $this->_options;
        return $options;
    }
}