[Issue 22737] Segmentation fault in CppMangleVisitor.getTiNamespace

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22737

--- Comment #3 from Iain Buclaw <ibuclaw at gdcproject.org> ---
This issue has the tag "rejects-valid" - but where's the valid C++ code?

If this template has no C++ equivalent, then it should be accepts-invalid, and
we issue an error at semantic-time as Matthias has already mentioned.

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