rector/config/set/symfony50.php

<?php

declare(strict_types=1);

use Rector\Renaming\Rector\MethodCall\RenameMethodRector;
use Rector\Renaming\Rector\Name\RenameClassRector;
use Rector\Renaming\ValueObject\MethodCallRename;
use function Rector\SymfonyPhpConfig\inline_value_objects;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;

# https://github.com/symfony/symfony/blob/5.0/UPGRADE-5.0.md

return static function (ContainerConfigurator $containerConfigurator): void {
    $containerConfigurator->import(__DIR__ . '/symfony50-types.php');

    $services = $containerConfigurator->services();

    $services->set(RenameClassRector::class)
        ->call('configure', [[
            RenameClassRector::OLD_TO_NEW_CLASSES => [
                'Symfony\Component\Debug\Debug' => 'Symfony\Component\ErrorHandler\Debug',
            ],
        ]]);

    $services->set(RenameMethodRector::class)
        ->call('configure', [[
            RenameMethodRector::METHOD_CALL_RENAMES => inline_value_objects([
                new MethodCallRename('Symfony\Component\Console\Application', 'renderException', 'renderThrowable'),
                new MethodCallRename(
                    'Symfony\Component\Console\Application',
                    'doRenderException',
                    'doRenderThrowable'
                ),
            ]),
        ]]);
};