Re: [Haskell-cafe] Trying to contact authors of "Real World Haskell"?

I don't think that CAN be done in Haskell (but just in case, I'm only saying it once). 2009/5/7 Neil Brown :

Although I heard that if you chant "I don't think this can be done in Haskell" three times in front of a text editor, Don Stewart appears and implements it in one line...