Function exp_u128
pub(in ::fmt::num) fn exp_u128(f: &mut Formatter<'_>, n: u128, is_nonnegative: bool, letter_e: u8) -> Resultexp_u128pub(in ::fmt::num) fn exp_u128(f: &mut Formatter<'_>, n: u128, is_nonnegative: bool, letter_e: u8) -> Result