I don't know either, but FWIW, there _are_ many (ok, several) Haskell implementation, but they only implement the language defined in the standard, and nobody h

I don't know either, but FWIW, there _are_ many (ok, several) Haskell implementation, but they only implement the language defined in the standard, and nobody has been able or willing to chase all the extensions in GHC. Does Ruby and MRI have specs detailed enough that you could implement the entired language from just those? Few languages do, but Scheme and Haskell are among them.