Correct way to have a #[ram(rtc_fast)] static mut in 2024 edition?

[blinry]

For a low-power application (on the ESP32-C6), I keep state in RTC memory like this:

#[ram(rtc_fast)]
static mut state: State = State::new();

I then access and modify the state in unsafe blocks.

Rust's 2024 edition has disallowed this. What's a good way to do it now?

[Dominaezzz]

Looks like we might need an RtcFastCell or something similar

[blinry]

I'd love a better solution than the status quo, maybe even one that doesn't require unsafe.

Would I be able to build a RtcFastCell type myself, or would it need to go into the esp-hal library?

[Dominaezzz]

Use the workaround described here for now.

[blinry]

For anyone finding this in the future, I used #![allow(static_mut_refs)] to make it work in the 2024 edition.