Confusing error message for extending enums

[DanielEScherzer]

Description

The following code:

<?php

enum MyEnum {}

class Demo extends MyEnum {}

Resulted in this output:

Fatal error: Class Demo cannot extend final class MyEnum in /in/mbUsQ on line 5

But I expected this output instead:

[some message about not being able to extend enums]

See https://3v4l.org/mbUsQ

For built-in enums (which https://3v4l.org/XvT2b reports were only added in 8.3 with Random\IntervalBoundary) the message is even more confusing:

<?php

class Demo extends Random\IntervalBoundary {}

produces

Fatal error: Non-enum class Demo cannot implement interface UnitEnum in /in/8VLv9 on line 3

See https://3v4l.org/8VLv9

PHP Version

PHP 8.2+

[DanielEScherzer]

I can send patches for these, but I'm just not sure if the fix for extending built in enums should go to 8.2 (or just 8.3+) since there were no core-provided enums in 8.2

[iluuu1994]

@DanielEScherzer master should be fine. This is not a bug, per se. Enums are classes, and this fact is not hidden in the engine (e.g. class_exists(), etc.). The message could be more precise though.