[Issue 18881] extern(C++) classes don't work properly in debuginfo

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18881

--- Comment #4 from Rainer Schuetze <r.sagitario at gmx.de> ---
AFAICT the vtable slot is at __vfptr[-1], but that's not reserved => crash when
trying "typeid(*baseCPPptr)".

--