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//@ check-pass
#![feature(thread_local)]
#![deny(tail_expr_drop_order)]
use std::marker::PhantomData;
use std::ops::{Deref, DerefMut};
pub struct Global;
#[thread_local]
static REENTRANCY_STATE: State<Global> = State { marker: PhantomData, controller: Global };
pub struct Token(PhantomData<*mut ()>);
pub fn with_mut<T>(f: impl FnOnce(&mut Token) -> T) -> T {
f(&mut REENTRANCY_STATE.borrow_mut())
}
pub struct State<T: ?Sized = Global> {
marker: PhantomData<*mut ()>,
controller: T,
}
impl<T: ?Sized> State<T> {
pub fn borrow_mut(&self) -> TokenMut<'_, T> {
todo!()
}
}
pub struct TokenMut<'a, T: ?Sized = Global> {
state: &'a State<T>,
token: Token,
}
impl<T> Deref for TokenMut<'_, T> {
type Target = Token;
fn deref(&self) -> &Self::Target {
todo!()
}
}
impl<T> DerefMut for TokenMut<'_, T> {
fn deref_mut(&mut self) -> &mut Self::Target {
todo!()
}
}
impl<T: ?Sized> Drop for TokenMut<'_, T> {
fn drop(&mut self) {
todo!()
}
}
fn main() {}
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