[Issue 19087] `final switch` cannot be used in -betterC

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19087

Seb <greensunny12 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |greensunny12 at gmail.com

--- Comment #1 from Seb <greensunny12 at gmail.com> ---
> It should probably be an `assert`.

Agreed! `final switch` is actually usable in `nothrow` code (see e.g.
https://run.dlang.io/is/mjVbPr), s.t. there's no reason to throw an exception.

Also programming errors are typically handled by `assert`.

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