"Call to a member function resolveScope() on null" on Symfony classes

[malteschlueter]

Bug Report

Subject	Details
Rector version	v0.18.5

I'm trying to develop a plugin in PHP 8.2 and Symfony 6.3 and want to downgrade it to PHP 7.4 using rector. For the application code it works fine, but I'm having a problem with some vendor classes (only Symfony classes). The error message is Could not process "/project-dir/downgrade-build/vendor/symfony/dependency-injection/ServiceLocator.php" file, due to: "System error: "Call to a member function resolveScope() on null"

I can't find a issue related to calling the resolveScope function.

This error occurs in the following classes

• symfony/dependency-injection/ServiceLocator.php
• symfony/dependency-injection/Compiler/ResolveChildDefinitionsPass.php
• symfony/framework-bundle/Command/ContainerLintCommand.php
• symfony/http-kernel/Controller/ArgumentResolver/ServiceValueResolver.php
• symfony/http-kernel/EventListener/ErrorListener.php

Minimal PHP Code Causing Issue

I've copied the symfony/http-kernel/Controller/ArgumentResolver/ServiceValueResolver.php to the demo.

The demo shows a different error to the one on my console: https://getrector.com/demo/dad0434f-b917-495d-8536-83b1f938a78b

Expected Behaviour

No error.

[samsonasik]

Reproduced with 2 rules combined:

Rector\DowngradePhp81\Rector\StmtsAwareInterface\DowngradeSetAccessibleReflectionPropertyRector;
Rector\DowngradePhp80\Rector\Expression\DowngradeMatchToSwitchRector;

ref https://getrector.com/demo/3326a93d-b4a0-4ed3-8d9d-41767fe10a72

[malteschlueter]

Thank you very much @samsonasik 👍
Rector processes now without any errors.

The downgraded Symfony has now some errors I need to investigate them i.e. the hash algorithm xxh128 which was introduced in PHP 8.1 is not available. I will try to create a new Rector downgrade rule for it.