[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 #1 from Marcelo Silva Nascimento Mancini <msnmancini at hotmail.com> ---
This error occurs only on DMD with this test code. But in my project it does
not work in both, and I do get "Error: unknown, please file report on
issues.dlang.org" instead of a segmentation fault. But 99% chance they are
related

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