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ooch! Indeed.

same example with virtual destructor:
[Wandbox]三へ( へ՞ਊ ՞)へ ﾊｯﾊｯ

This illustrates you always want to use tools like gcc/clang address sanitizers, or msvc /RTC (Run-Time Error...

You can not create an instance of an abstract/interface class, which is why you can not return an instance.
You can, however, return a pointer/reference to an abstract class, which is created from a...