interacsion

use std::any::type_name_of_val;
use std::marker::PhantomData;

trait Functor<'a> {
    type F<A: 'a>;

    fn fmap<A, B>(a: Self::F<A>, f: impl Fn(A) -> B + 'a) -> Self::F<B>;
    
    fn traverse<A>(a: Self::F<A>, f: impl FnMut(A));
}

interacsion

use std::cell::UnsafeCell;
use std::mem::ManuallyDrop;
use std::panic::{AssertUnwindSafe, catch_unwind, resume_unwind};
use std::sync::atomic::{AtomicU8, Ordering};

const INITIALIZED_BIT: u8 = 0b01;
const LOCKED_BIT: u8 = 0b10;

union Data<T, F> {
    value: ManuallyDrop<T>,