The rustc dependency of stable-mir-json is currently to nightly-2024-11-29.
We should upgrade it to be ahead of Anza's rustc fork and to not lose connection to latest rustc development.

However, we cannot upgrade to versions after early April due to a temporary refactoring tweak that moved stable_mir into rustc_smir. The import structure from this change onwards is still in place but is a temporary measure, so we should not upgrade to it (unless it remains in place for much longer).

Upgrading to the latest nightly before this change (or a reasonably close one) is a promising intermediate step.

UPDATE: rust-lang/rust#143848 appears to have moved back what was formerly stable_mir into its place, but under the new name rustc_public.