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Name	Action
..
AbstractArgument.php	Edit
ArgumentInterface.php	Edit
BoundArgument.php	Edit
IteratorArgument.php	Edit
ReferenceSetArgumentTrait.php	Edit
RewindableGenerator.php	Edit
ServiceClosureArgument.php	Edit
ServiceLocator.php	Edit
ServiceLocatorArgument.php	Edit
TaggedIteratorArgument.php	Edit

Editing: ServiceClosureArgument.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\DependencyInjection\Argument;

use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
use Symfony\Component\DependencyInjection\Reference;

/**
 * Represents a service wrapped in a memoizing closure.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 */
class ServiceClosureArgument implements ArgumentInterface
{
    private $values;

public function __construct(Reference $reference)
    {
        $this->values = [$reference];
    }

/**
     * {@inheritdoc}
     */
    public function getValues()
    {
        return $this->values;
    }

/**
     * {@inheritdoc}
     */
    public function setValues(array $values)
    {
        if ([0] !== array_keys($values) || !($values[0] instanceof Reference || null === $values[0])) {
            throw new InvalidArgumentException('A ServiceClosureArgument must hold one and only one Reference.');
        }

$this->values = $values;
    }
}