PSA: all traces of KDL and miette have been removed from facet, arborium, etc.
https://github.com/facet-rs/facet/pull/1730
Having been put on a list by their author, I simply do not feel comfortable continuing to support first-party integrations there.
For the time being, error reporting will be worse. I'm reviewing alternatives (including a new diagnostics crate). For markup it's... back to YAML for now.
I'm sad about this just like I'm sad about the whole thing. I am not interested in migrating to forks of either of those projects. Thanks for your attention.