[TomasVotruba]

The src/functions/rule_class_aliases.php bootstrap (a composer files autoload entry) eagerly called class_alias(NewClass::class, OldFqn), which autoloads the retargeted rule classes on every bootstrap.

The scoped build lints the output under PHP 7.4. There, loading those classes hits their PHP 8 promoted private readonly constructor props and fails:

PHP Parse error: syntax error, unexpected 'private' (T_PRIVATE) in rules/Visibility/Rector/Class_/ChangeMethodVisibilityRector.php on line 30

so build_scoped_rector failed.

Register the legacy names via spl_autoload_register instead, aliasing to the current class only when the old FQN is actually requested. Nothing loads at bootstrap, so the 7.4 lint no longer parses PHP 8 rule classes.

rule_class_aliases.php is added to the existing "internal functions" group in phpstan.neon next to the sibling node_helper.php, as spl_autoload_register is otherwise forbidden.