Code shared from the Rust Playground

playground.rs

use std::thread;

struct Shitpointer(*mut i32);
unsafe impl Send for Shitpointer {}

fn main() {
    let mut v: Vec<i32> = vec![1, 3, 3, 7];
    let ptr_1 = Shitpointer(v.as_mut_ptr()); 
    let ptr_2 = Shitpointer(v.as_mut_ptr()); 
    
    let t_1 = thread::spawn(move || unsafe { *ptr_1.0.offset(0) += 1});
    let t_2 = thread::spawn(move || unsafe { *ptr_2.0.offset(3) += 20});
    t_1.join();
    t_2.join();
    println!("{:?}", v);
}