You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: incarnation_store.rs
    path of file: ./repos/habitat/components/butterfly/src/server
    
    the code of the file until where you have to start completion: //! Provide the means to persist a Supervis
    
    fn can_load_valid_values_from_disk() {
        let path = Temp::new_file().expect("Could not create temp file");
        let mut buffer = File::create(&path).expect("could not create file");
        buffer.write_all(b"42").expect("could not write file");

        let i = IncarnationStore::new(&path);
        assert_eq!(i.load().unwrap(), Incarnation::from(42));
    }