File: main.cpp

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struct A { int i;};

struct B
{
  int i;
  B& operator = (const B& b)
  {
    i = b.i;
    return *this;
  }
};

A funcA()
{
  A a;
  a.i = 10;
  return a;
}


B funcB()
{
  B b;
  b.i = 10;
  return b;
}

int main()
{
  A a;
  a.i = 20;
  assert((funcA() = a).i == 20); // legal

  B b;
  b.i = 20;
  assert((funcB() = b).i == 20);  // legal
}