Using facade.dll to run rust code via python

test.py

from facade import dll
import utils

print utils.multi_sum(3)

utils.h

int multi_sum(int);

utils.rs

#![crate_type = "dylib"]
use std::thread;
use std::sync::mpsc;

#[no_mangle]
pub extern fn multi_sum(value: i32) -> i32 {
    let (tx, rx) = mpsc::channel();
    let mut answers: [i32; 10] = [0;10];

    for i in 0..10 {
        let tx = tx.clone();
        thread::spawn(move || {
            let answer = i * value;
            tx.send((i, answer)).unwrap();
        });
    }

    for _ in 0..10 {
        match rx.recv() {
            Ok((i, answer)) => answers[i as usize] = answer,
            Err(error) => println!("{}", error),
        }
    }

    return answers.into_iter().fold(0, |acc, n| {acc + n});
}

Usage:
Run rustc utils.rs -> results in utils.dll file
Runt python test.py -> results in 135

I would like to stress the fact that the utils.h is not required, but it does save me the python code: utils.declare('int multi_sum(int);') @ line 3 of test.py