I tried:

Question/Task: Write a lock implementation in Rust

I got this (lol):

    use std::sync::Mutex;

    struct Lock {
        mutex: Mutex<()>,
    }

    impl Lock {
        fn new() -> Lock {
            Lock {
                 mutex: Mutex::new(()),
            }
        }

        fn lock(&self) -> MutexGuard<()> {
            self.mutex.lock().unwrap()
        }

        fn unlock(&self) {
            self.mutex.unlock();
        }
    }