1  /* { dg-do run } */
       2  /* { dg-options "-fsanitize=null -w" } */
       3  /* { dg-shouldfail "ubsan" } */
       4  
       5  union U {
       6    int i;
       7  };
       8  
       9  int
      10  main (void)
      11  {
      12    union U *u = 0;
      13    return u->i;
      14  }
      15  
      16  /* { dg-output "member access within null pointer of type 'union U'" } */