[Issue 18308] __VERSION__ insufficient; should also have __VERSION_MINOR__ and __VERSION_PATCH__ (eg 2.078.1)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18308

--- Comment #1 from Timothee Cour <timothee.cour2 at gmail.com> ---
actually a `__traits(version_fully_qualified)` would be preferable to avoid
introducing all those keywords.

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