1  union U
       2  {
       3    double d;
       4    __complex__ int c;
       5  };
       6  
       7  double gd;
       8  extern double bar (union U);
       9  
      10  double foo (int b, double d, int c1, int c2)
      11  {
      12    union U u;
      13    double r;
      14  
      15    if (b)
      16      {
      17        u.d = d;
      18        r = u.d;
      19      }
      20    else
      21      {
      22        __real__ u.c = c1;
      23        __imag__ u.c = c2;
      24        r = bar (u);
      25      }
      26  
      27    return r;
      28  }