rust

fn calculate_length(s: &String) -> usize {
    s.len()
}

fn append_suffix(s: &mut String) {
    s.push_str(" world");

use std::io::Write;
use tempfile::NamedTempFile;

fn main() -> std::io::Result<()> {
    let mut tmpfile = NamedTempFile::new()?;
    writeln!(tmpfile, "Hello, temp file!")?;

use std::collections::HashSet;

fn main() {
    let mut words = HashSet::new();
    words.insert("hello");
    words.insert("world");

struct UserId(u32);

impl From<u32> for UserId {
    fn from(id: u32) -> Self {
        UserId(id)
    }

use std::fmt;

struct Point {
    x: i32,
    y: i32,
}

use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Arc;
use std::thread;

fn main() {
    let counter = Arc::new(AtomicUsize::new(0));

use std::marker::PhantomData;

struct Token<'a> {
    _marker: PhantomData<&'a ()>,
}

use rayon::prelude::*;

fn main() {
    let numbers: Vec<_> = (0..1000).collect();

    let sum: i32 = numbers

use log::{info, warn, error};

fn main() {
    env_logger::init();

    info!("Application started");

fn divide(a: i32, b: i32) -> Option<i32> {
    if b == 0 {
        None
    } else {
        Some(a / b)
    }

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

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

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

struct Warehouse {