[Issue 16980] [REG2.072.0] vtable issue in slightly complex scenario

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16980

--- Comment #2 from Martin Nowak <code at dawg.eu> ---
For whatever reason the ab in the ab.bar() call of the dtor isn't casted to B

(cast(B)dst.ab).bar(); // <- correct in main, offsets this (AB) by 8 byte
ab.bar(); // <- broken, uses this (AB) w/o offset which is A, thus methods of B
are called on A's vtbl

should be 

(cast(B)ab).bar();

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