[Issue 13601] static if (__ctfe) should emit warning

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13601

--- Comment #5 from Martin Nowak <code at dawg.eu> ---
This commit introduced the regression.
https://github.com/D-Programming-Language/dmd/commit/43a6c87194cae799650249b10a4f7c910081d280

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