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Thank you for clarifying! I did not know that all functions in Haskell are considered curried. My surprise stemmed in part from reading a bit about "arity" from [1].

It's interesting how the theoretical model of Haskell--"all functions in Haskell take just single arguments"--differs from implementation, where, for functions of known arity, GHC in particular does not actually "follow the currying story literally" [2].

[1] http://hackage.haskell.org/trac/ghc/wiki/Commentary/Rts/Hask...

[2] http://community.haskell.org/~simonmar/papers/eval-apply.pdf

Any time. It's one of the more interesting parts of Haskell to me, so it's one I always remember.

You're absolutely right to point out that implementations and theory often differ; compilers often do tricky things behind the scences.

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