fix #60 : invalid state(CCS_VALUE) in parse_char_class()
bitset_and(BitSetRef dest, BitSetRef bs)
{
  int i;
  for (i = 0; i < (int )BITSET_SIZE; i++) { dest[i] &= bs[i]; }
}

bitset_and(BitSetRef dest, BitSetRef bs)
{
  int i;
  for (i = 0; i < (int )BITSET_SIZE; i++) { dest[i] &= bs[i]; }
}
