This is true of so many ecosystems. In the past year, I think I’ve had to rewrite an ESLint config twice, transition a Prettier config to another format, update React in a project and a good half of the other dependencies through some breaking changes, etc.

It’s not really unique to Rust, and happens for projects that are well past v1 (in React’s case, v19 - and they still haven’t figured out suspense, not that I’d want to rush them).

Still, I’d love for things to remain consistent over time. The breaking changes in this version of axum are pretty easy to update to though, and you might even be able to just regex replace these in all your files since it’s just a matter of using braces now instead.