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Squeak Smalltalk bootstrapped itself (back in 1996) by implementing its virtual machine in Slang, a subset of Smalltalk that can essentially be pretty-printed into C.

Back to the future: the story of Squeak, a practical Smalltalk written in itself. http://www.vpri.org/pdf/tr1997001_backto.pdf

Its a neat twist that RPython is taking the same engine that optimizes the VM to JIT code that runs on the VM.

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