pub fn skip_many<Input, P>(p: P) -> SkipMany<Input, P>where
    <Input as StreamOnce>::Error: ParseError<<Input as StreamOnce>::Token, <Input as StreamOnce>::Range, <Input as StreamOnce>::Position>,
    Input: Stream,
    P: Parser<Input>,Expand description
Parses p zero or more times ignoring the result.
NOTE: If p can succeed without consuming any input this may hang forever as skip_many will
repeatedly use p to parse the same location in the input every time
let result = skip_many(digit())
    .parse("A");
assert_eq!(result, Ok(((), "A")));