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It's funny, you could also say this of Ruby and MRI, which is in so many other respects the polar opposite of Haskell.

Edit: Spelling.

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.

Ruby is actually an ISO standard. Admittedly, it's frozen at Ruby 1.8 and it doesn't count for much.

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