DowngradeNeverTypeDeclarationRector creates a fatal error bc never type hint is removed

[kkmuffme]

Bug Report

Subject	Details
Rector version	last dev-main
Installed as	composer dependency

Minimal PHP Code Causing Issue

See https://getrector.com/demo/895266d8-462e-40a9-98e8-81d61c3b1919

<?php

class Foo {
    public function run(): void {
        
    }
}

class Bar extends Foo {
    /**
     * @return never
     */
    public function run(): never {
        exit;
    }
}

new Bar();

Responsible rules

• DowngradeNeverTypeDeclarationRector

Expected Behavior

Rector created code has a fatal: https://3v4l.org/ODTRm#v8.4.12
Using void works correctly/no fatal: https://3v4l.org/7u2rKv#v8.4.12

I already told you in #9333 (comment) but you closed it to contributors only...

[samsonasik]

That unfortunatelly similar dangerous for changing to void, even parent has native mixed, that will got same error, see https://3v4l.org/fWSJJ

Ensure parent and child have same return first, if you need some custom rule, use this rule as reference for creating your custom rule:

https://getrector.com/rule-detail/add-return-type-declaration-based-on-parent-class-method-rector

[kkmuffme]

The code you provided is already a fatal BEFORE rector runs and is completely different.

The code I provided has a fatal BECAUSE of rector.

I don't need a custom rule, I just need you to understand the basics of the PHP type hint system and fix this in rector that "never" gets changed to "void" instead of removing the type hint

[samsonasik]

see my PR for it:

• [DowngradePhp81] Handle parent is void on DowngradeNeverTypeDeclarationRector rector-downgrade-php#311

still should not happen in real life code, as when you don't follow parent code, this can easily error, see PR description.