Next one I bumped the Rust version in our CI setup to 1.94, which required updating some of the compile test output. See https://github.com/diesel-rs/diesel/pull/4996 for the relevant changes. This is again a regular task to do after each rust update.
After that I spend quite a bit of time on addressing all the feedback on my PR to add a #[diagnostic::on_unknown_item] attribute to rustc: https://github.com/rust-lang/rust/pull/152901. This is hopefully now nearly ready to be merged. By accident I submitted this PR while a large refactoring on how attributes are handled in rustc was going on, so this required reworking large parts of my PR to make it compatible with the new infrastructure. On the bright side 
@jana did a great job with the new infrastructure, it was a pleasure to work with it.
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