RPython is lovely. I get a fast interpreter, but I can still use the full Python toolset for unit testing (e.g. coverage with coveralls.io).
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The Futamura projections are really cool: partially applying an interpreter gives you a compiler!
I'm not really sure what this enables though. You'd get a pretty poor compiler.
Is this idea used much? I've occasionally heard it referenced for RPython.
Wow, pypy now has a reverse debugger! https://morepypy.blogspot.co.uk/2016/07/reverse-debugging-for-python.html (also a nice demo of how RPython facilitates experiments)
Blogged: RPython for Fun and Profit: http://t.co/13yRjuUjBg