Function clap_conf::with_toml_env

pub fn with_toml_env<'a, G, S, IT>(
    a: G, 
    it: IT
) -> Holder<Holder<Enver, G>, Localizer<Value>> where
    G: Getter<'a, Out = &'a str>,
    S: AsRef<str>,
    IT: IntoIterator<Item = S>,