FilterProcessResult.stub not being respected, RenderCallbackRuleTest failing

[mglaman]

Bug report

RenderCallbackRuleTest has started to fail against FilterProcessResult. The stub identifies $callable as callable-string but now PHPStan thinks it is just string

    /**
     * @param callable-string $callback
     * @param array<int|string, mixed> $args
     */
    public function createPlaceholder($callback, array $args): string {

    }

It broke with 2.1.38, opened phpstan/phpstan#14118

Issues to review

• Rework phpDoc inheritance to resolve through reflection instead of re-walking the hierarchy phpstan/phpstan-src#4829
• ConstantArrayType: prevent unnecessary work phpstan/phpstan-src#4811

[mglaman]

The fix here is to change the test. instead of analyzing FilterProcessResult make a similar test