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

[d-bugmail at puremagic.com]

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

Adam D. Ruppe <destructionator at gmail.com> changed:

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                 CC|                            |destructionator at gmail.com

--- Comment #11 from Adam D. Ruppe <destructionator at gmail.com> ---
One of the useful things about the current behavior would be mixing in a thing
that needs a C callback function; the callback may be different for different
instantiations.

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