[Issue 19807] undefined reference involving separate compilation, `unittest`, `double`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19807

--- Comment #2 from kinke at gmx.net ---
Another question is whether the unittest is actually supposed to be
'instantiated' by the import of the module alone. The PosixEventDriver class
template isn't instantiated in the main module, so I'd say it should not.

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