[Issue 18774] meta used in .di files causes link errors

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18774

--- Comment #3 from Manu <turkeyman at gmail.com> ---
Well in this case, the symbol is emit in a .di file, which means it's never
written to any object file; hence the unresolved external...

But that's actually kind-of irrelevant. The big question I have here is, where
is the link error coming from?! Why is there a reference in main.obj to
Zip!(...)'s init value? Where could that symbol reference possibly be coming
from? There's no runtime calls to zip().

I don't understand how the link error is even emerging, because there should be
nothing making such a reference.

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