use std::any::TypeId;

use std::cell::{RefCell, UnsafeCell};

use std::collections::HashMap;

use std::ffi::CString;

use std::marker::PhantomData;

use std::os::raw::{c_char, c_int};

use std::rc::Rc;

use std::{mem, ptr, str};

use crate::error::{Error, Result};

use crate::ffi;

use crate::function::Function;

use crate::stdlib::StdLib;

use crate::string::String;

use crate::table::Table;

use crate::thread::Thread;

use crate::types::{Callback, Integer, LightUserData, LuaRef, Number, RegistryKey};

use crate::userdata::{AnyUserData, MetaMethod, UserData, UserDataMethods};

use crate::util::{

assert_stack, callback_error, check_stack, get_gc_userdata, get_main_state,

get_meta_gc_userdata, get_wrapped_error, init_error_registry, init_gc_metatable_for,

init_userdata_metatable, pop_error, protect_lua, protect_lua_closure, push_gc_userdata,

push_meta_gc_userdata, push_string, push_userdata, push_wrapped_error, StackGuard,

use crate::value::{FromLua, FromLuaMulti, MultiValue, Nil, ToLua, ToLuaMulti, Value};

use {

crate::types::AsyncCallback,

futures_core::future::LocalBoxFuture,

futures_task::noop_waker,

futures_util::future::{self, FutureExt, TryFutureExt},

std::{

future::Future,

task::{Context, Poll, Waker},

},

pub struct Lua {

struct ExtraData {

pub(crate) struct AsyncPollPending;

pub(crate) static WAKER_REGISTRY_KEY: u8 = 0;

impl Drop for Lua {

impl Lua {