1  /* Origin: Joseph Myers <jsm28@cam.ac.uk>.  */
       2  /* As an extension, GCC allows a struct or union to be cast to its own
       3     type, but failed to allow this when a typedef was involved.
       4     Reported as PR c/2735 by <cowan@ccil.org>.  */
       5  union u { int i; };
       6  typedef union u uu;
       7  union u a;
       8  uu b;
       9  
      10  void
      11  foo (void)
      12  {
      13    a = (union u) b;
      14    a = (uu) b;
      15    b = (union u) a;
      16    b = (uu) a;
      17  }