pub fn parse_until_before<'i: 't, 't, F, T, E>(
    parser: &mut Parser<'i, 't>,
    delimiters: Delimiters,
    error_behavior: ParseUntilErrorBehavior,
    parse: F
) -> Result<T, ParseError<'i, E>>where
    F: for<'tt> FnOnce(&mut Parser<'i, 'tt>) -> Result<T, ParseError<'i, E>>,