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    <h3>Editing: ServiceSubscriberTrait.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

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

namespace Symfony\Contracts\Service;

use Psr\Container\ContainerInterface;
use Symfony\Contracts\Service\Attribute\SubscribedService;

/**
 * Implementation of ServiceSubscriberInterface that determines subscribed services from
 * method return types. Service ids are available as &quot;ClassName::methodName&quot;.
 *
 * @author Kevin Bond &lt;kevinbond@gmail.com&gt;
 */
trait ServiceSubscriberTrait
{
    /** @var ContainerInterface */
    protected $container;

    /**
     * {@inheritdoc}
     */
    public static function getSubscribedServices(): array
    {
        $services = method_exists(get_parent_class(self::class) ?: '', __FUNCTION__) ? parent::getSubscribedServices() : [];
        $attributeOptIn = false;

        if (\PHP_VERSION_ID &gt;= 80000) {
            foreach ((new \ReflectionClass(self::class))-&gt;getMethods() as $method) {
                if (self::class !== $method-&gt;getDeclaringClass()-&gt;name) {
                    continue;
                }

                if (!$attribute = $method-&gt;getAttributes(SubscribedService::class)[0] ?? null) {
                    continue;
                }

                if ($method-&gt;isStatic() || $method-&gt;isAbstract() || $method-&gt;isGenerator() || $method-&gt;isInternal() || $method-&gt;getNumberOfRequiredParameters()) {
                    throw new \LogicException(sprintf('Cannot use &quot;%s&quot; on method &quot;%s::%s()&quot; (can only be used on non-static, non-abstract methods with no parameters).', SubscribedService::class, self::class, $method-&gt;name));
                }

                if (!$returnType = $method-&gt;getReturnType()) {
                    throw new \LogicException(sprintf('Cannot use &quot;%s&quot; on methods without a return type in &quot;%s::%s()&quot;.', SubscribedService::class, $method-&gt;name, self::class));
                }

                $serviceId = $returnType instanceof \ReflectionNamedType ? $returnType-&gt;getName() : (string) $returnType;

                if ($returnType-&gt;allowsNull()) {
                    $serviceId = '?'.$serviceId;
                }

                $services[$attribute-&gt;newInstance()-&gt;key ?? self::class.'::'.$method-&gt;name] = $serviceId;
                $attributeOptIn = true;
            }
        }

        if (!$attributeOptIn) {
            foreach ((new \ReflectionClass(self::class))-&gt;getMethods() as $method) {
                if ($method-&gt;isStatic() || $method-&gt;isAbstract() || $method-&gt;isGenerator() || $method-&gt;isInternal() || $method-&gt;getNumberOfRequiredParameters()) {
                    continue;
                }

                if (self::class !== $method-&gt;getDeclaringClass()-&gt;name) {
                    continue;
                }

                if (!($returnType = $method-&gt;getReturnType()) instanceof \ReflectionNamedType) {
                    continue;
                }

                if ($returnType-&gt;isBuiltin()) {
                    continue;
                }

                if (\PHP_VERSION_ID &gt;= 80000) {
                    trigger_deprecation('symfony/service-contracts', '2.5', 'Using &quot;%s&quot; in &quot;%s&quot; without using the &quot;%s&quot; attribute on any method is deprecated.', ServiceSubscriberTrait::class, self::class, SubscribedService::class);
                }

                $services[self::class.'::'.$method-&gt;name] = '?'.($returnType instanceof \ReflectionNamedType ? $returnType-&gt;getName() : $returnType);
            }
        }

        return $services;
    }

    /**
     * @required
     *
     * @return ContainerInterface|null
     */
    public function setContainer(ContainerInterface $container)
    {
        $ret = null;
        if (method_exists(get_parent_class(self::class) ?: '', __FUNCTION__)) {
            $ret = parent::setContainer($container);
        }

        $this-&gt;container = $container;

        return $ret;
    }
}
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