That’s the point. I didn’t know about the feature flags feature of Rust/Cargo. Of course, if you know it, you “have to” skip it in each tutorial. IMHO, it should be okay 🙂 Thank you for your answer.

Perhaps, there could be a different between cargo-update and cargo update.

Thanks a lot. That’s it. But, what have I done now 😀 ? I believe I misunderstand the dependency inclusion. I have to learn something about features and why they aren’t activated by default.

I like IntelliJ as my first choice Java IDE. The Rust-Plugin is not as good as expected but every Update is welcome for a better experience. I thank all contributors for their effort.