type File = String;

fn open(f: &mut File) {
}

fn close(f: &mut File) {
}

fn read(f: &mut File, save_to: &mut Vec<u8>) {
}

fn main() {
    let mut file1 = File::from("file1.txt");
    open(&mut file1);
    //read(file1, vec![]);
    close(&mut file1);
}

// left off at listing 3.1