Explorative: tools for learning

[nrc]

The first item on the Rust roadmap is "Rust should have a lower learning curve". I think tools can be a part of that, and I'm keen to see if there are innovative ways we can support this goal.

[Manishearth]

I talked about some ideas in https://github.com/Manishearth/rust-clippy/issues/1737 and later https://manishearth.github.io/blog/2017/05/19/teaching-programming-proactive-vs-reactive/

We may be able to build this. I don't have time currently 🤕