I don't think C++ interface is easily feasible, as far as I know no language managed to do that yet, probably because of the wildly different ABI between C++ co

I don't think C++ interface is easily feasible, as far as I know no language managed to do that yet, probably because of the wildly different ABI between C++ compilers. Anyway, I would add to your list Go concurrency constructs (channels, "go"-like statements), polymorphic types, and, personally, significant whitespace for indentation, like Python. Rust is a big step in the right direction, although it's a bit too complex|heavy for scripts.