[Issue 20012] export inside mixin doesn't seem to work

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20012

--- Comment #25 from Manu <turkeyman at gmail.com> ---
To be fair, what I think is that extern(C) should be mangled the same in all
places that it's valid... Which is; global scope. extern(C) doesn't have any
precedent outside of global scope, and I just don't care what it does in places
where I don't consider it valid.

That said, if I had to choose, I'd say be the same everywhere. The odd guy out
should be the explicit one.

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