Re: [Haskell-cafe] Questions about the Functor class and it's use in "Data types à la carte"

Dominic Steinitz dominic.steinitz at
Sun Dec 16 05:23:34 EST 2007

> keep in mind that Haskell "composition" (.)
> is not really composition in the category-theoretic
> sense, because it adds extra laziness. Use this

Do you have a counter-example of (.) not being function composition in
the categorical sense?

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