[Issue 23279] Segmentation fault on mixin template + using unknown type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23279

--- Comment #9 from Dlang Bot <dlang-bot at dlang.rocks> ---
dlang/dmd pull request #15417 "merge stable" was merged into master:

- 452e170d2ad0c547dd1a4fe45e21af0cde87565c by Razvan Nitu:
  Fix Issues 23951 and 23279 - traits(hasMember) does not follow alias this +
ICE when using traits(hasMember) on an erroneous member (#15406)

  * Fix Issue 23951 - traits(getMember) does not follow alias this

  * Fix Issue 23279 - ICE when using traits(hasMember) with an erroneous member

https://github.com/dlang/dmd/pull/15417

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