[Issue 19775] multiple argument string mixin doesn't expand tuples

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19775

--- Comment #1 from Nick Treleaven <nick at geany.org> ---
Started working on this, but I'm having trouble building dmd on Windows (even
with Digger):
https://github.com/ntrel/dmd/commits/mixin-tuple

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