Delete.php

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<?php
namespace Magento\User\Controller\Adminhtml\User\Role;

use Magento\Framework\Controller\ResultFactory;

class Delete extends \Magento\User\Controller\Adminhtml\User\Role
{
    public function execute()
    {
        $resultRedirect = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
        $rid = $this->getRequest()->getParam('rid', false);
        $currentUser = $this->_userFactory->create()->setId($this->_authSession->getUser()->getId());

        if (in_array($rid, $currentUser->getRoles())) {
            $this->messageManager->addError(__('You cannot delete self-assigned roles.'));
            return $resultRedirect->setPath('adminhtml/*/editrole', ['rid' => $rid]);
        }

        try {
            $this->_initRole()->delete();
            $this->messageManager->addSuccess(__('You deleted the role.'));
        } catch (\Exception $e) {
            $this->messageManager->addError(__('An error occurred while deleting this role.'));
        }

        return $resultRedirect->setPath("*/*/");
    }
}