1  /* PR c/4697
       2     Test whether operand has no effect warning is given for compound
       3     expression.  */
       4  /* { dg-do compile } */
       5  /* { dg-options "-O2 -Wunused" } */
       6  
       7  int b;
       8  int foo (int a)
       9  {
      10    a = a + 1, 5 * b; /* { dg-warning "right-hand operand of comma expression has no effect" } */
      11    return a;
      12  }