D-Programming-Language/phobos — pull request #2094 by AndrejMitrovic (2014-04-21 20:56:27+00:00)
Title: Issue 12464 - Inject imports to core.vararg on Posix when wrapping C-style variadic functions via AutoImplement.

https://issues.dlang.org/show_bug.cgi?id=12464

Btw, can anyone explain why `core.vararg` is only required on Posix? What's causing it to be implicitly imported on Windows?