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

[d-bugmail at puremagic.com]

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

--- Comment #2 from Seb <greensunny12 at gmail.com> ---
A start for a discussion: https://github.com/dlang/druntime/pull/2274

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