[Issue 23728] Add `version(debug)`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23728

RazvanN <razvan.nitu1305 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |razvan.nitu1305 at gmail.com

--- Comment #1 from RazvanN <razvan.nitu1305 at gmail.com> ---
Is there a use case that this would support that is not possible with the
existing semantics? I have a hard time finding the usefulness of this addition.

--