Unable to use aliased String namespace since 8.2

[InvisibleSmiley]

Description

The following code:

<?php
use Foo\Bar\String as MyString;

Resulted in this output:

Fatal error: Cannot alias 'Foo\Bar\String' as it is a built-in type in ... on line 3

But I expected this output instead:

Note that Foo\Bar\String is just a namespace (part), not a class/interface/trait/enum.

I checked the 8.2 documentation (migration guide, backward incompatible changes, changelog) and it seems to me this was not really intended. Worked fine up until 8.1.x.

PHP Version

8.2.0

Operating System

No response

[InvisibleSmiley]

I was told the issue was caused by this:
#9402

[iluuu1994]

Hi @InvisibleSmiley! What's the use case for this? This would've failed before as well, just in a different location.

https://3v4l.org/QM5mP

[InvisibleSmiley]

As I said, my case is about namespaces only. Example (actual things / inheritance etc. in the NS are irrelevant):
https://3v4l.org/Q9Fbi

[iluuu1994]

Hmm, I think this is an oversight of #9402.
@Girgias The use-case above looks valid as long as we support these keywords in namespaces, so I'm thinking we should revert the PR.

[Girgias]

Fine with me, this only came up because someone on Room 11 was doing some weird stuff and not understanding the weird error message that resulted later.

Feel free to revert now or I'll do this next week when I get back from holiday. :)