Know what your code can do before it runs

struct Config {
    host: string,
    port: number,
    verbose: bool,
}

fn load_config(path: string) -> Config ![io] {
    let raw = fs.read(path);
    return Config.parse(raw);
}

fn handle(req: http.Request) -> http.Response ![net] {
    return http.Response {
        status: 200,
        body: "Sailfin is running",
    };
}

fn main() ![io, net] {
    let config = load_config("app.toml");
    print("Listening on " + config.host);
    serve(handle, { port: config.port });
}