File: main.cpp

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struct A
{
  int i;
};

struct B: public A {
  int j;
};

int func(A a)
{
  return a.i;
}

int main()
{
  B b;
  b.i = 1;

  assert((* ((A*)&b)).i == 1); // This works fine.

  int  bi = func( * ((A*)&b)); // Satabs Ok.
                               // cbmc error
  assert(bi == 1);
}