Function fragment_value 

fn fragment_value<'a, P>(
    delimiter: P,
) -> impl Parser<Input<'a>, String, ErrMode<ParseStack<'a>>>
where
    P: Parser<Input<'a>, &'a str, ErrMode<ParseStack<'a>>>,

Parses the value of a URL fragment from an alpm-package-source string.

Parsing is attempted after the URL fragment type has been determined.

E.g. tag=v1.0.0 ^^^^^^ This part