list.rs

use ::std::cell::Cell;
use ::std::fmt::Debug;
use ::std::ptr::NonNull;

// A node in my forward linked-list
pub struct GcBox<T: Debug + ?Sized> {
    counter: Cell<usize>,
    next: Option<NonNull<GcBox<Debug>>>,
    value: T,
}

impl<T: Debug + ?Sized> GcBox<T> {
    pub fn inc(&self) {
        self.counter.set(self.counter.get() + 1);
    }
}

// Start of the list
pub struct Root {
    head: Option<NonNull<GcBox<Debug>>>,
}

fn main() {
  let hello = String::from("hello");
  {
    let mut rt = Root { head: None };
    let hello_box = GcBox { counter: Cell::new(0), next: None, value: &hello };
    hello_box.inc();
    rt.head = Some(NonNull::new(Box::into_raw(Box::new(hello_box))).unwrap());
  }
}