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The thought that immediately springs to mind is bootstrapping CL on top of parenscript.

• regularfry 7y ago
  ...and https://github.com/jscl-project/jscl/blob/master/src/compiler/codegen.lisp https://github.com/jscl-project/jscl/blob/master/src/compile... makes it look like that's almost what's going on here, but not quite.