[Issue 24837] Can't version() or static if() to include keys in an enum

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24837

--- Comment #4 from anonymous4 <dfj1esp02 at sneakemail.com> ---
Note there's no such versioning in other OSes, they just declare everything
without caring what was in older versions and what was in recent versions, only
man pages document it sometimes.

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