[Issue 21389] case statement in bad switch wrongly reported as duplicated

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21389

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |regression

--- Comment #1 from Basile-z <b2.temp at gmx.com> ---
According to the compilers available on run.dlan this wouldbe a 2.094
regression.
(https://run.dlang.io/is/Svfzoy)

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