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/matrix-rust-sdk/examples/timeline/src
    
    the code of the file until where you have to start completion: use anyhow::Result;
use clap::Parser;
use futures_util::StreamExt;
use matrix_sdk::{self, config::SyncSettings, ruma::OwnedRoomId, Client};
use matrix_sdk_ui::timeline::RoomExt;
use url::Url;

#[derive(Parser, Debug)]
struct
    
async fn main() -> Result<()> {
    tracing_subscriber::fmt::init();

    let cli = Cli::parse();
    let room_id = cli.room_id.clone();
    let client = login(cli).await?;

    let sync_settings = SyncSettings::default();

    // Wait for the first sync response
    println!("Wait for the first sync");

    client.sync_once(sync_settings.clone()).await?;

    // Get the timeline stream and listen to it.
    let room = client.get_room(&room_id).unwrap();
    let timeline = room.timeline().await.unwrap();
    let (timeline_items, mut timeline_stream) = timeline.subscribe().await;

    println!("Initial timeline items: {timeline_items:#?}");
    tokio::spawn(async move {
        while let Some(diff) = timeline_stream.next().await {
            println!("Received a timeline diff: {diff:#?}");
        }
    });

    // Sync forever
    client.sync(sync_settings).await?;

    Ok(())
}