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Backwards-compatibly changing existing features feels qualitatively the same to me as adding new features. In either case you can ignore them until you need to work on a codebase t…

At least in Rust, capture granularity is per-variable, so I think closures don't contain a stack frame pointer? Though, I'm not sure why this would matter to a user evaluating Rust…

Saying library authors are content with their absence is probably a bit too strong. There's not really another option, and I doubt many folks would choose not to author libraries f…

Functional typically implies higher-order functions, of which there are none in that Python code.

What's it like working with Rust full-time? Is it similar to using any other language for a job? Do you find yourself enjoying coding more? Do you get unnecessarily caught up in mi…

Every language has different idioms. In many cases, what works in C++ doesn't work in Rust. Generally, anything the book says is bad you should take as qualified to mean bad in the…

They have them in the Czech Republic, too. I've been on one in Prague.

I wish `and_then` were named `flat_map` so badly.

Also seems like you could benefit from the entry() api (available on both BTreeMap and HashMap): http://doc.rust-lang.org/std/collections/struct.BTreeMap.htm... I think the example…