[dependencies]
mongodb = "0.9.1"
bson = "0.14.0"
uuid = { version = "0.8.1", features = ["v4"]}

#[macro_use]
extern crate bson;

use bson::Bson;
use bson::spec::BinarySubtype;
use mongodb::Client;
use uuid::Uuid;

fn main() {
    let client = Client::with_uri_str("mongodb://localhost:27017").unwrap();

    let collection = client.database("mydb").collection("test");

    let id = Bson::Binary(BinarySubtype::UuidOld, Uuid::new_v4().as_bytes().to_vec());

    collection.insert_one(doc! {"id": id, "name": "aaa"}, None).unwrap();

    for doc in collection.find(None, None).unwrap() {
        match doc {
            Ok(doc) => {
                println!("{}", doc);
            }
            Err(e) => {
                eprintln!("{}", e);
            }
        }
    }
}

{ _id: ObjectId("5e62c72d0092514100eaa03e"), id: BinData(0, 0xb28894c6bc334de99a9c0968dc1fefda), name: "aaa" }

> use mydb
switched to db mydb
> db.test.find({}).pretty()
{
        "_id" : ObjectId("5e62c72d0092514100eaa03e"),
        "id" : BinData(3,"soiUxrwzTemanAlo3B/v2g=="),
        "name" : "aaa"
}