[Issue 15626] extern(C++) calling crash

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15626

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---
https://github.com/D-Programming-Language/dmd/pull/5403

There's no easy way to hack this in. The trouble is you have a C++ base class
with no virtual functions, so it has no vtbl[]. I.e. is it not a class at all,
it is a struct. This is not supported.

The way to fix the code is to replace interface I with abstract class I, move
the fields from C into I, and ditch class C entirely.

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