Function chrono::format::scan::number

pub(super) fn number(
    s: &str,
    min: usize,
    max: usize,
) -> ParseResult<(&str, i64)>

Tries to parse the non-negative number from min to max digits.

The absence of digits at all is an unconditional error. More than max digits are consumed up to the first max digits. Any number that does not fit in i64 is an error.