Macro peel_ip::prelude::delimited

macro_rules! delimited {
    (
$ i : expr , $ submac : ident ! ( $ ( $ args : tt ) * ) , $ ( $ rest : tt ) +
) => { ... };
    (
$ i : expr , $ f : expr , $ ( $ rest : tt ) + ) => { ... };
}

delimited!(I -> IResult<I,T>, I -> IResult<I,O>, I -> IResult<I,U>) => I -> IResult<I, O> delimited(opening, X, closing) returns X