`Service name must be a non-empty string.` with phpstan v2.1.34

[AlexSkrypnyk]

Bug Report

Subject	Details
Rector version	e.g. v2.3.1 (invoke vendor/bin/rector --version)
phpstan version	e.g. v2.1.34 (invoke vendor/bin/rector --version)

Rector 2.3.1 fails when used with PHPStan 2.1.34 due to several breaking API changes in PHPStan. The errors include:

1. Removed Visitor Classes

  PHP Warning: Undefined array key 0 in PHPStanContainerMemento.php on line 35
  [ERROR] "Service name must be a non-empty string." On line: 291

Cause: PHPStan 2.1.34 removed VariadicFunctionsVisitor and VariadicMethodsVisitor
classes. Rector's PHPStanContainerMemento.php still references them.

2. Changed OptimizedSingleFileSourceLocator Constructor

  [ERROR] Argument #2 ($cache) must be of type PHPStan\Cache\Cache, string given

Cause: OptimizedSingleFileSourceLocator::__construct() signature changed from
(FileNodesFetcher, string) to (FileNodesFetcher, Cache, PhpVersion, string).

3. FiberScope Introduction

  [ERROR] "Cannot suspend outside of a fiber"

Cause: PHPStan 2.1.34 introduces FiberScope for scope resolution. The node
callback in PHPStanNodeScopeResolver.php expects MutatingScope but now receives
FiberScope.

[samsonasik]

Already fixed on latest dev-main, see PR:

• Bump to PHPStan 2.1.34 and fix compatible code rector-src#7844

[samsonasik]

Rector 2.3.2 released for it :)

https://github.com/rectorphp/rector/releases/tag/2.3.2