1  /* { dg-do compile } */
       2  
       3  unsigned b;
       4  void f()
       5  {
       6    for(;;)
       7      if(!b?:(b=0))
       8        ;
       9      else if(b%0<b?:b) /* { dg-warning "division by zero" } */
      10        for(;;)
      11  	;
      12  }