Function repeat_till0_

fn repeat_till0_<I, O, C, P, E, F, G>(
    f: &mut F,
    g: &mut G,
    i: &mut I,
) -> PResult<(C, P), E>
where
    I: Stream,
    C: Accumulate<O>,
    F: Parser<I, O, E>,
    G: Parser<I, P, E>,
    E: ParserError<I>,