Macro peel_ip::prelude::fold_many_m_n

macro_rules! fold_many_m_n {
    (
$ i : expr , $ m : expr , $ n : expr , $ submac : ident ! (
$ ( $ args : tt ) * ) , $ init : expr , $ f : expr ) => { ... };
    (
$ i : expr , $ m : expr , $ n : expr , $ f : expr , $ init : expr , $ fold_f :
expr ) => { ... };
}

fold_many_m_n!(usize, usize, I -> IResult<I,O>, R, Fn(R, O) -> R) => I -> IResult<I, R> Applies the parser between m and n times (n included) and folds the list of return value

the embedded parser may return Incomplete

 named!(multi<&[u8], Vec<&[u8]> >,
   fold_many_m_n!(2, 4, tag!( "abcd" ), Vec::new(), |mut acc: Vec<_>, item| {
     acc.push(item);
     acc
 }));

 let a = b"abcdefgh";
 let b = b"abcdabcdefgh";
 let c = b"abcdabcdabcdabcdabcdefgh";

 assert_eq!(multi(&a[..]),Error(error_position!(ErrorKind::ManyMN,&a[..])));
 let res = vec![&b"abcd"[..], &b"abcd"[..]];
 assert_eq!(multi(&b[..]), Done(&b"efgh"[..], res));
 let res2 = vec![&b"abcd"[..], &b"abcd"[..], &b"abcd"[..], &b"abcd"[..]];
 assert_eq!(multi(&c[..]), Done(&b"abcdefgh"[..], res2));