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: worker.rs
    path of file: ./repos/trunk/examples/webworker/src/bin
    
    the code of the file until where you have to start completion: use js_sys::Array;
use wasm_bindgen::{prelude::*, JsCast};
use web_sys::{DedicatedWorkerGlobalScope, MessageEvent};

fn main() {
    console_error_panic_hook::set_once();
    web_sys::console::log_1(&"worker starting".into());

    let scope = DedicatedWorkerGlobalScope::from(JsValue::from(js_sys::global()));
    let scope_clone = scope.clone();

    let onmessage = Closure::wrap(Box::new(move |msg: MessageEvent| {
        web_sys::console::log_1(&"got message".into());

        let data = Array::from(&msg.data());
        le
    
fn main() {
    console_error_panic_hook::set_once();
    web_sys::console::log_1(&"worker starting".into());

    let scope = DedicatedWorkerGlobalScope::from(JsValue::from(js_sys::global()));
    let scope_clone = scope.clone();

    let onmessage = Closure::wrap(Box::new(move |msg: MessageEvent| {
        web_sys::console::log_1(&"got message".into());

        let data = Array::from(&msg.data());
        let a = data
            .get(0)
            .as_f64()
            .expect("first array value to be a number") as u32;
        let b = data
            .get(1)
            .as_f64()
            .expect("second array value to be a number") as u32;

        data.push(&(a * b).into());
        scope_clone
            .post_message(&data.into())
            .expect("posting result message succeeds");
    }) as Box<dyn Fn(MessageEvent)>);
    scope.set_onmessage(Some(onmessage.as_ref().unchecked_ref()));
    onmessage.forget();

    // The worker must send a message to indicate that it's ready to receive messages.
    scope
        .post_message(&Array::new().into())
        .expect("posting ready message succeeds");
}