Function pin

pub fn pin<Value: for<'hook> HookValue<'hook>, InnerHook: Default + HookPollNextUpdate + HookUnmount, U: for<'hook> FnMut(Pin<&'hook mut InnerHook>) -> <Value as HookValue<'hook>>::Value>(
    use_hook: U,
) -> UseFnHook<InnerHook, U>