message: bigint::monty: use mac_digit
diff: @@ -220,7 +220,7 @@ pub fn sub_sign(a: &[BigDigit], b: &[BigDigit]) -> (Sign, BigUint) {
  /// Three argument multiply accumulate:
  /// acc += b * c
  -fn mac_digit(acc: &mut [BigDigit], b: &[BigDigit], c: BigDigit) {
  +pub fn mac_digit(acc: &mut [BigDigit], b: &[BigDigit], c: BigDigit) {
  if c == 0 {
  return;
  }
  