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    <h3>Editing: RemoveEmptyControllerArgumentLocatorsPass.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\Component\HttpKernel\DependencyInjection;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

/**
 * Removes empty service-locators registered for ServiceValueResolver.
 *
 * @author Nicolas Grekas &lt;p@tchwork.com&gt;
 */
class RemoveEmptyControllerArgumentLocatorsPass implements CompilerPassInterface
{
    private $controllerLocator;

    public function __construct(string $controllerLocator = 'argument_resolver.controller_locator')
    {
        if (0 &lt; \func_num_args()) {
            trigger_deprecation('symfony/http-kernel', '5.3', 'Configuring &quot;%s&quot; is deprecated.', __CLASS__);
        }

        $this-&gt;controllerLocator = $controllerLocator;
    }

    public function process(ContainerBuilder $container)
    {
        $controllerLocator = $container-&gt;findDefinition($this-&gt;controllerLocator);
        $controllers = $controllerLocator-&gt;getArgument(0);

        foreach ($controllers as $controller =&gt; $argumentRef) {
            $argumentLocator = $container-&gt;getDefinition((string) $argumentRef-&gt;getValues()[0]);

            if (!$argumentLocator-&gt;getArgument(0)) {
                // remove empty argument locators
                $reason = sprintf('Removing service-argument resolver for controller &quot;%s&quot;: no corresponding services exist for the referenced types.', $controller);
            } else {
                // any methods listed for call-at-instantiation cannot be actions
                $reason = false;
                [$id, $action] = explode('::', $controller);

                if ($container-&gt;hasAlias($id)) {
                    continue;
                }

                $controllerDef = $container-&gt;getDefinition($id);
                foreach ($controllerDef-&gt;getMethodCalls() as [$method]) {
                    if (0 === strcasecmp($action, $method)) {
                        $reason = sprintf('Removing method &quot;%s&quot; of service &quot;%s&quot; from controller candidates: the method is called at instantiation, thus cannot be an action.', $action, $id);
                        break;
                    }
                }
                if (!$reason) {
                    // see Symfony\Component\HttpKernel\Controller\ContainerControllerResolver
                    $controllers[$id.':'.$action] = $argumentRef;

                    if ('__invoke' === $action) {
                        $controllers[$id] = $argumentRef;
                    }
                    continue;
                }
            }

            unset($controllers[$controller]);
            $container-&gt;log($this, $reason);
        }

        $controllerLocator-&gt;replaceArgument(0, $controllers);
    }
}
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