Well, I can't speak for tooling or productivity comparison to C/C++, but Rust has one of the best programming language documentations I have ever had the pleasure of reading [1].
(I think it's even better, but I'm biased)
One I can note is that I really like the new sections. I've never quite liked that the current book is just a bunch of chapters all in a row. Not that that's necessarily bad in and of itself, but I do think the new way is better.
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(Thanks for writing great documentation, though.)