fn greet(name: string) -> result<string> {
    if (name matches "") {
        return failure("empty-name", "name was empty");
    }
    return success("hello " + name);
}
fn start_main() -> i64 {
    let valid: result<string> = greet("aspl");
    if (valid::ok) {
        print(valid::value);
        print(" ");
    } else {
        return 1;
    }
    let invalid: result<string> = greet("");
    if (invalid::ok) {
        return 2;
    }
    print(invalid::error::code);
    return 0;
}