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: lib.rs
    path of file: ./repos/wasm-bindgen/examples/wasm-in-web-worker/src
    
    the code of the file until where you have to start completion: use std::cell::RefCell;
use std::rc::Rc;
use wasm_bindgen::prelude::*;
use web_sys::{console, HtmlElement, HtmlInputElement, MessageEvent, Worker};

/// A number evaluation struct
///
/// This struct will be the main object which responds to messages passed
    
pub fn startup() {
    // Here, we create our worker. In a larger app, multiple callbacks should be
    // able to interact with the code in the worker. Therefore, we wrap it in
    // `Rc<RefCell>` following the interior mutability pattern. Here, it would
    // not be needed but we include the wrapping anyway as example.
    let worker_handle = Rc::new(RefCell::new(Worker::new("./worker.js").unwrap()));
    console::log_1(&"Created a new worker from within Wasm".into());

    // Pass the worker to the function which sets up the `oninput` callback.
    setup_input_oninput_callback(worker_handle);
}