File: main.c

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// clang-format off
int f1(int *arr)
  __CPROVER_requires(
    __CPROVER_forall {
      int i;
      (0 <= i && i < 10) ==> arr[i] == 0
    } ||
    arr[9] == -1 ||
    __CPROVER_exists {
      int i;
      (0 <= i && i < 10) && arr[i] == i
    }
  )
  __CPROVER_ensures(
    __CPROVER_return_value == 0
  )
// clang-format on
{
  return 0;
}

int main()
{
  int arr[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  f1(arr);
}