Editing: ReturnReference.php

<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Framework\MockObject\Stub;

use function sprintf;
use PHPUnit\Framework\MockObject\Invocation;
use SebastianBergmann\Exporter\Exporter;

/**
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class ReturnReference implements Stub
{
    /**
     * @var mixed
     */
    private $reference;

public function __construct(&$reference)
    {
        $this->reference = &$reference;
    }

public function invoke(Invocation $invocation)
    {
        return $this->reference;
    }

public function toString(): string
    {
        $exporter = new Exporter;

return sprintf(
            'return user-specified reference %s',
            $exporter->export($this->reference),
        );
    }
}