[Issue 21785] Cannot declare variable of opaque enum with base type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21785

moonlightsentinel at disroot.org changed:

           What    |Removed                     |Added
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           Keywords|                            |diagnostic

--- Comment #1 from moonlightsentinel at disroot.org ---
(In reply to moonlightsentinel from comment #0)
> [...] `var` can just be initialized by `void*.init`.

This isn't correct for all opaque enums so the code is rightfully rejected.

Added `diagnostic` because the error message is wrong.

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