pub fn flat_takec<I, O, E, C, F>(
    input: I,
    len: C,
    parser: F,
) -> Result<(I, O), Err<E>>where
    E: ParseError<I>,
    C: ToUsize + Copy,
    F: Parser<I, O, E>,
    I: InputTake + InputLength + InputIter,
    O: InputLength,Available on crate feature 
mtls only.Expand description
Take len bytes from input, and apply parser.