You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.rs
    path of file: ./repos/serenity/examples/e14_slash_commands/src
    
    the code of the file until where you have to start completion: mod commands;

use std::env;

use serenity::async_trait;
use serenity::builder::{CreateInteractionResponse, CreateInteractionResponseMessage};
use serenity::model::application::{Command, Interaction};
use serenity::model::gateway::Ready;
use serenity::model::id::GuildId;
use serenity::prelude::*;

struct Hand
    
async fn main() {
    // Configure the client with your Discord bot token in the environment.
    let token = env::var("DISCORD_TOKEN").expect("Expected a token in the environment");

    // Build our client.
    let mut client = Client::builder(token, GatewayIntents::empty())
        .event_handler(Handler)
        .await
        .expect("Error creating client");

    // Finally, start a single shard, and start listening to events.
    //
    // Shards will automatically attempt to reconnect, and will perform exponential backoff until
    // it reconnects.
    if let Err(why) = client.start().await {
        println!("Client error: {why:?}");
    }
}