thread 'main' has overflowed its stack about anchors

[raiscui]

b=b.map can't work too

let mut b =Box::new( a.watch()); 
(1..1200).for_each(|i| {
        b=Box::new(b.map(function.clone()));
    });

[raiscui]

try bumpalo is OK!

use std::cell::RefCell;

use anchors::singlethread::{Anchor, Engine, Var};
thread_local! {
    static ENG: RefCell<Engine> = RefCell::new(
        Engine::new_with_max_height(3002)
    );
}
use bumpalo::{collections::Vec, Bump};
fn main() {
    let bump = Bump::new();

    let a = ENG.with(|e| Var::new(1));
    let a_watch = a.watch();

    let function = Box::new(|x: &i32| x + 1);
    let mut v: Vec<Anchor<i32>> = Vec::new_in(&bump);

    v.push(a_watch.map(function.clone()));

    // for i in 1..1200 {
    //     v.push(v[i - 1].map(function.clone()));
    // }

    for _ in 1..10000 {
        for i in 1..2200 {
            v.push(v[i - 1].map(function.clone()));
        }
        for _ in 1..2200 {
            v.pop();
        }
    }

    for i in 1..2200 {
        v.push(v[i - 1].map(function.clone()));
    }
    let end = ENG.with(|e| e.borrow_mut().get(&v[2199]));
    // let end2 = engine.get(&c);
    println!("{} ", end);
}