Code shared from the Rust Playground

playground.rs

use nom::combinator::opt;
use nom::multi::many0;
use nom::sequence::pair;
use nom::Parser;

fn make<Input, Item, Delim, E>(
    item: impl Parser<Input, Item, E>,
    delim: impl Parser<Input, Delim, E>,
) -> impl Parser<Input, (), E>
where
    Input: Eq + Clone,
    E: nom::error::ParseError<Input>,
{
    pair(opt(item), many0(pair(delim, item))).map(|(first, rest)| ())
}