[Issue 13454] Unit tests should be compiled in a module, where they are declared

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13454

--- Comment #4 from Sobirari Muhomori <dfj1esp02 at sneakemail.com> ---
In practice template unittests are often independent of their template instance
and simply result in code duplication.

(In reply to Dicebot from comment #3)
> It is illegal to build D projects with non-consistent version flags exactly
> for this reason. version(unittest) is no different.

Phobos is compiled without unittests, that will prohibit user code from being
compiled with unittests.

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