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/smithay/smallvil/src
    
    the code of the file until where you have to start completion: #![allow(irrefutable_let_patterns)]

mod handlers;

mod grabs;
mod input;
mod state;
mod winit;

use smithay::reexports::{
    calloop::EventLoop,
    wayland_server::{Display, DisplayHandle},
};
pub use state::Smallvil;

pub struct CalloopData {
    state: Smallvil,
    display_handle: DisplayHandle,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    if let Ok(env_filter) = tracing_subscriber::EnvFilter::try_from_default_env(
    
fn main() -> Result<(), Box<dyn std::error::Error>> {
    if let Ok(env_filter) = tracing_subscriber::EnvFilter::try_from_default_env() {
        tracing_subscriber::fmt().with_env_filter(env_filter).init();
    } else {
        tracing_subscriber::fmt().init();
    }

    let mut event_loop: EventLoop<CalloopData> = EventLoop::try_new()?;

    let display: Display<Smallvil> = Display::new()?;
    let display_handle = display.handle();
    let state = Smallvil::new(&mut event_loop, display);

    let mut data = CalloopData {
        state,
        display_handle,
    };

    crate::winit::init_winit(&mut event_loop, &mut data)?;

    let mut args = std::env::args().skip(1);
    let flag = args.next();
    let arg = args.next();

    match (flag.as_deref(), arg) {
        (Some("-c") | Some("--command"), Some(command)) => {
            std::process::Command::new(command).spawn().ok();
        }
        _ => {
            std::process::Command::new("weston-terminal").spawn().ok();
        }
    }

    event_loop.run(None, &mut data, move |_| {
        // Smallvil is running
    })?;

    Ok(())
}