I'm looking into this and even talked to Jeremy Ashkenas about it last year. Unfortunately, I've not had the time to get any further than reading the PyPy tuto

I'm looking into this and even talked to Jeremy Ashkenas about it last year. Unfortunately, I've not had the time to get any further than reading the PyPy tutorials: http://morepypy.blogspot.nl/2011/04/tutorial-writing-interpreter-with-pypy.html http://morepypy.blogspot.nl/2011/04/tutorial-writing-interpr... However, I hope to have some time in the fall in which to pursue this. If anyone else takes it up in the meantime, I'd love to contribute. Interestingly, a native CoffeeScript interpreter already exists: Poetics, which runs on the Rubinius VM. Very cool project. Another very interesting CoffeeScript project is the MoonScript project, which compiles a variation of CoffeeScript into Lua.