1  /* { dg-do compile } */
       2  /* { dg-options "-Wunused -W" } */
       3  
       4  int
       5  f1 (unsigned int x)
       6  {
       7    int c = ({ union { unsigned int a; int b; } u; u.a = x; u.b; });
       8    return c;
       9  }
      10  
      11  void
      12  f2 (void)
      13  {
      14    struct S { int i; } a;
      15    int b[1];
      16    a.i = 1;
      17    a.i;				/* { dg-warning "no effect" } */
      18    b[0] = 1;
      19    b[0];				/* { dg-warning "no effect" } */
      20  }
      21  
      22  void
      23  f3 (void)
      24  {
      25    struct S { int i; } a;	/* { dg-warning "set but not used" } */
      26    int b[1];			/* { dg-warning "set but not used" } */
      27    a.i = 1;
      28    b[0] = 1;
      29  }