1  foo (a, b)
       2  {
       3    a = b + b;
       4    if (a)
       5      return a;
       6    return b;
       7  }
       1  foo (a, b)
       2  {
       3    a = b + b;
       4    if (a)
       5      return a;
       6    return b;
       7  }