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: app.rs
    path of file: ./repos/loco/examples/llm-candle-inference/src
    
    the code of the file until where you have to start completion: use std::sync::Arc;

use async_trait::async_trait;
use axum::Extension;
use kalosm::language::{Llama, LlamaSource};
use loco_rs::{
    app::{AppContext, Hooks},
    boot::{create_app, Boot
    
    async fn after_routes(router: axum::Router, _ctx: &AppContext) -> Result<axum::Router> {
        // cache should reside at: ~/.cache/huggingface/hub
        println!("loading model");
        let model = Llama::builder()
            .with_source(LlamaSource::llama_7b_code())
            .build()
            .unwrap();
        println!("model ready");
        let st = Arc::new(RwLock::new(model));
        Ok(router.layer(Extension(st)))
    }