It might not be a big deal, but a few weeks ago I started a new project that was going to reuse code from an existing project. The new project defaulted to 2018 (nightly compiler) and I got a bunch of errors with my module imports. It was just frustrating because it felt like it was a breaking change and one of the reasons I started using Rust is the promise of no breaking changes.
These kinds of changes are generally on par with other “never break” languages like Java and C++. Java 1.4 feels very different than Java 10.
It’s tough!
I fail to see how Rust editions could be much smoother managed. Or should they never fix anything in the language?