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That's not a very good definition. It means that GHC-flavoured Haskell isn't functional: http://www.haskell.org/haskellwiki/Tail_recursion

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I think you might have misinterpreted the contents of that page. As someone who has worked on GHC, I can assure you that it does perform tail call optimisation.

I believe I have. Thank you for correcting me.

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