1  /* { dg-do compile } */
       2  /* { dg-options "-O2 -fno-tree-fre -fdump-tree-vrp1" } */
       3  
       4  int
       5  foo (int a, int b)
       6  {
       7    if (a == b)
       8      /* This should be folded to if (1)  */
       9      if (a == b)
      10        return a + b;
      11  }
      12  
      13  /* { dg-final { scan-tree-dump-times "if" 1 "vrp1" } } */