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: flume.rs
    path of file: ./repos/crossbeam/crossbeam-channel/benchmarks
    
    the code of the file until where you have to start completion: mod message;

const MESSAGES: usize = 5_000_000;
const THREADS: usize = 4;

pub fn shuffle<T>(v: &mut [T]) {
    use std::cell::Cell;
    use std::num::Wrapping;

    let len = v.len();
    if len <= 1 {
        return;
    }

    thread_local! {
       
    
pub fn shuffle<T>(v: &mut [T]) {
    use std::cell::Cell;
    use std::num::Wrapping;

    let len = v.len();
    if len <= 1 {
        return;
    }

    thread_local! {
        static RNG: Cell<Wrapping<u32>> = const { Cell::new(Wrapping(1)) };
    }

    RNG.with(|rng| {
        for i in 1..len {
            // This is the 32-bit variant of Xorshift.
            // https://en.wikipedia.org/wiki/Xorshift
            let mut x = rng.get();
            x ^= x << 13;
            x ^= x >> 17;
            x ^= x << 5;
            rng.set(x);

            let x = x.0;
            let n = i + 1;

            // This is a fast alternative to `let j = x % n`.
            // https://lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/
            let j = ((x as u64).wrapping_mul(n as u64) >> 32) as u32 as usize;

            v.swap(i, j);
        }
    });
}