Cargo.toml

[package]
name = "xxx"
version = "0.1.0"
authors = ["..."]

[dependencies]
bson = "0.9.0"
mongodb = "0.3.3"

main.rs

#[macro_use(bson, doc)]
extern crate bson;
extern crate mongodb;

use bson::Bson;
use mongodb::{Client, ThreadedClient};
use mongodb::db::ThreadedDatabase;

fn main() {
    let client = Client::connect("localhost", 27017)
        .expect("Failed to initialize standalone client.");

    let coll = client.db("test").collection("movies");

    let doc = doc! { "title" => "Jaws",
                      "array" => [ 1, 2, 3 ] };

    // Insert document into 'test.movies' collection
    coll.insert_one(doc.clone(), None)
        .ok().expect("Failed to insert document.");

    // Find the document and receive a cursor
    let mut cursor = coll.find(Some(doc.clone()), None)
        .ok().expect("Failed to execute find.");

    let item = cursor.next();

    // cursor.next() returns an Option<Result<Document>>
    match item {
        Some(Ok(doc)) => match doc.get("title") {
            Some(&Bson::String(ref title)) => println!("{}", title),
            _ => panic!("Expected title to be a string!"),
        },
        Some(Err(_)) => panic!("Failed to get next from server!"),
        None => panic!("Server returned no results!"),
    }
}