rust

fn main() {
    let numbers = vec![1, 2, 3, 4, 5];

    let sum: i32 = numbers
        .iter()
        .filter(|&&x| x % 2 == 0)

use std::collections::HashMap;
use std::hash::Hash;

const NIL: usize = usize::MAX;

struct Node<K, V> {

trait Container {
    type Item;
    fn get(&self, index: usize) -> Option<&Self::Item>;
}

struct Warehouse {

use std::env;

fn main() {
    let port: u16 = env::var("PORT")
        .unwrap_or_else(|_| "8080".to_string())
        .parse()

use std::collections::VecDeque;

pub struct RollingAverage {
    buf: VecDeque<f64>,
    capacity: usize,
    sum: f64,

#[derive(Debug, Clone)]
pub struct Order {
    pub id: u64,
    pub amount_cents: i64,
    pub currency: [u8; 3],
}

use std::sync::mpsc::{self, SyncSender};
use std::sync::{Arc, Mutex};
use std::thread;

mod worker;
use worker::{Message, Worker};

use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AppConfig {
    #[serde(default)]
    pub server: ServerConfig,

use std::collections::VecDeque;

fn main() {
    let mut queue = VecDeque::new();
    queue.push_back(1);
    queue.push_back(2);

use std::os::raw::c_int;

pub const LOCK_EX: c_int = 2;
pub const LOCK_NB: c_int = 4;
pub const LOCK_UN: c_int = 8;

use axum::{routing::get, Router, Json};
use serde::Serialize;

#[derive(Serialize)]
struct Response {
    message: String,

use tokio::time::{sleep, Duration};

#[tokio::main]
async fn main() {
    let fast = sleep(Duration::from_millis(50));
    let slow = sleep(Duration::from_millis(200));