On: Go for the JVM, written in Scala

[gaius]

Well, some language communities consider it to be a point of pride to be self-hosting (e.g. Java) but for others (e.g. Python) it's not a big deal.

[adw → gaius]

I believe RPython to be a proper subset of Python, and PyPy is written in RPython.

You need to bootstrap off CPython to compile the compiler, of course!

[uriel → gaius]

This is another area where Go prefers pragmatism over everything else.