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: stm.rs
    path of file: ./repos/tfs/conc/src/sync
    
    the code of the file until where you have to start completion: //! Software transactional memory.

use {Atomic, Guard};
use std::sync::atomic;

/// A software transactional memory container.
pub struct Stm<T> {
    /// The inner data.
    inner: Atomic<T>,
}

impl<T> Stm<T> {
    /// Create a new STM container.
    pub fn new(data: Option<Box<T>>) -> Stm<T> {
        Stm {
            inner: Atomic::new(data),
        }
    }

    /// Update the data.
    ///
    /// This applies cl
    
    fn multi_threaded() {
        let stm = Arc::new(Stm::new(Some(Box::new(0))));

        let mut j = Vec::new();
        for _ in 0..16 {
            let stm = stm.clone();
            j.push(thread::spawn(move || {
                for _ in 0..1_000_000 {
                    stm.update(|x| Some(Box::new(*x.unwrap() + 1)))
                }
            }))
        }

        for i in j {
            i.join().unwrap();
        }

        assert_eq!(*stm.load().unwrap(), 16_000_000);
    }