[rust] operating on a vector in parallel with unsafe rust

parallel_op_vec.rs

#![feature(unique)]

use std::thread::spawn;

// operating on a vector in parallel
fn main() {
  let mut data:Vec<u32> = vec![1u32, 2, 3];
  println!("{:?}", data);
  let head = data.as_mut_ptr();
  let mut guards = (0..3).map(|i|
    unsafe {
      let mut target = std::ptr::Unique::new(head.offset(i));
      let guard = spawn(move || {
        std::ptr::write(target.get_mut(), 10 + i as u32);
      });
      guard
    });
 
  if guards.all(|guard| match guard.join() { Ok(_) => true, Err(_) => false }) {
    println!("{:?}", data);
  } else {
    println!("__COULD_NOT_JOIN_ALL__");
  }
}