message: ff: Use readable literals
diff: @@ -342,7 +342,7 @@ impl<E: AsRef<[u64]>> Iterator for BitIterator<E> {
  #[test]
  fn test_bit_iterator() {
  - let mut a = BitIterator::new([0xa953d79b83f6ab59, 0x6dea2059e200bd39]);
  + let mut a = BitIterator::new([0xa953_d79b_83f6_ab59, 0x6dea_2059_e200_bd39]);
  let expected = "01101101111010100010000001011001111000100000000010111101001110011010100101010011110101111001101110000011111101101010101101011001";
  for e in expected.chars() {
  @@ -354,10 +354,10 @@ fn test_bit_iterator() {
  let expected = "1010010101111110101010000101101011101000011101110101001000011001100100100011011010001011011011010001011011101100110100111011010010110001000011110100110001100110011101101000101100011100100100100100001010011101010111110011101011000011101000111011011101011001";
  let mut a = BitIterator::new([
  - 0x429d5f3ac3a3b759,
  - 0xb10f4c66768b1c92,
  - 0x92368b6d16ecd3b4,
  - 0xa57ea85ae8775219,
  + 0x429d_5f3a_c3a3_b759,
  + 0xb10f_4c66_768b_1c92,
  + 0x9236_8b6d_16ec_d3b4,
  + 0xa57e_a85a_e877_5219,
  ]);
  for e in expected.chars() {
  