Generate a situation causing undefined behavior when deleting through a base pointer

It is necessary to show an example where an object of a derived class is deleted through a pointer to an abstract base class, which does not declare its destructor as virtual. In such a case, undefined behavior occurs or an exception is thrown.

struct A {
    virtual void foo() = 0;
    // destructor is not virtual
};

struct B : A {
    ~B(); // should be called correctly
};