[Issue 20053] add mixin types

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20053

--- Comment #6 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/dmd pull request #12339 "[dmd-cxx] Backport fixes and trivial features
from upstream dmd" was merged into dmd-cxx:

- a749391899e307be076a5202d9b0cc5e48240f4b by Walter Bright:
  [dmd-cxx] fix Issue 20053 - add mixin types

https://github.com/dlang/dmd/pull/12339

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