#![feature(async_await)]
#![allow(unused_variables, dead_code)]

use futures::future::{self, Future, FutureExt};

fn main() {
    let result = run();
}

async fn run() -> String {
    let mut input = input_data().await;
    let nodes: Vec<Node> = Vec::new();

    for node in nodes {
        input = node.run(input);
    }

    input
}

async fn input_data() -> String {
    String::new()
}

struct Node {
    id: i32,
}

impl Node {
    fn run(&self, s: String) -> String {
        format!("{}, {}", s, id)
    }
}