Very useful collection! A few points:<p>- He doesn't mention benchmarking, which is built into the testing capabilities of the compiler and is very nice to have.<p>- The only profiling tool I've had success with is Instruments, which I find harder to use in general than many of the alternatives, so I look forward to progress on this front.<p>- A good REPL would be <i>very</i> nice to have, for more than just "programming in the small" (but maybe that is what he meant by "experimentation"). There used to be one, but it had lots of issues, so it was understandably but lamentably killed.<p>- Cargo is already a <i>very</i> nice package manager. It feels like it has learned from many mistakes made by ruby, python, and node (though I think it resembles npm the most) and hasn't been frustrating at all for me. Notably, I find the workflow much easier than go's, despite its comparative youth. It is missing a central registry, but github serves the purpose decently at the moment.