Function voile_util::pest_util::strict_parse

pub fn strict_parse<'a, P, F, R, T>(
    rule: R, 
    input: &'a str, 
    f: F
) -> Result<T, String> where
    P: Parser<R>,
    R: RuleType,
    F: FnOnce(Pair<'a, R>) -> T,