But you claim Java can hot swap... I happen to know all about hot-swapping in Java, and it's only good for very simple debugging reloads... not at all at the same level as Dart VM. No one who knows Java would claim that.

Common Lisp is only hot-swappable when you're not running a binary, at least from what I know of SBCL.

So, it's hard to take your comment seriously. I am unfamiliar with Visual C++'s hot-swapping capabilities, but to claim the language itself can do it seems pretty ridiculous to me, as all you've got is machine code at runtime, C++ has no hot-swapping runtime and could never have one... which makes me think you're just confused about what we're talking about... I am not talking about debuggers here.