Ad Hoc Figment

figment 配置库的临时提供者。

use figment::Figment;
use adhoc_figment::AdHocProvider;

fn main() {
    let ad_hoc = AdHocProvider::new("key", "value");
    let figment = Figment::from(ad_hoc);
    let value: String = figment.extract_inner("key").unwrap();
    assert_eq!(value, "value");
}