rust

enum Status {
    Ok,
    Error(String),
    Pending,
}

# Install
cargo install cargo-expand

# Expand entire crate
cargo expand

use std::collections::HashMap;

fn main() {
    let mut scores = HashMap::new();
    scores.insert("Alice", 10);
    scores.insert("Bob", 20);

use std::fs;
use std::num::ParseIntError;

fn read_port(path: &str) -> Result<u16, Box<dyn std::error::Error>> {
    let contents = fs::read_to_string(path)?;
    let port: u16 = contents.trim().parse()?;

use std::fs;
use std::io::Result;

fn main() -> Result<()> {
    let contents = fs::read_to_string("input.txt")?;
    println!("File contents: {}", contents);

use std::fs::File;
use std::io::{BufRead, BufReader, Result};

fn main() -> Result<()> {
    let file = File::open("input.txt")?;
    let reader = BufReader::new(file);

fn greet(name: &str) {
    println!("Hello, {}", name);
}

fn main() {
    let owned = String::from("Alice");

use color_eyre::Result;

fn might_fail() -> Result<()> {
    Err(color_eyre::eyre::eyre!("Something went wrong"))
}

use std::mem;

fn main() {
    let mut x = 5;
    let mut y = 10;

use std::rc::Rc;
use std::cell::RefCell;

fn main() {
    let data = Rc::new(RefCell::new(vec![1, 2, 3]));

struct Logger {
    name: String,
}

impl Drop for Logger {
    fn drop(&mut self) {

[package]
name = "my-app"
version = "0.1.0"

[dependencies]
tokio = "1"