Shared via Rust Playground

playground.rs

#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]

struct Asdf(i32, Option<Gc<Asdf>>);

struct Gc<T>(*const T);

impl<T> Drop for Gc<T> {
    fn drop(&mut self) {
        // remove from roots
    }
}

#[derive(Default)]
struct Heap<T> {
    contents : Vec<T>,
    roots : Vec<usize>
}


fn main() {
    let mut heap : Heap<Asdf> = Heap{contents: vec!(), roots: vec!()};
    println!("Hello");
}