So I don't have the same intuition for desugaring `vec!` that I do for desugaring `for (auto&& blah : blarg)`, but in either case if you desugar it the problem becomes a lot more clear. The Rust borrow checker errors I'm sure become second nature just like the C++ template instantiation ones do, but that is faint praise. To get some inscrutable C++ template instantiation error you have to mess with templates, and that's for people who know what they're doing. In Rust it seems like the borrow checker isn't for pros, it's C++-template complexity that you need to get basic shit done.

C++ is actually a pretty gradually-typed language, and I'm in general a fan of gradual typing. I don't mind that some people prefer BDSM-style typing, but IMHO that goes with GC e.g. Haskell a lot better than it does with trying to print something out or copy it or whatever.