haskell - Where's the functor in the natural transformation? -


As long as I have an older category of Edward Cemet - Xtra package: 

  - | A natural change type between fertility and fertility f: ~ & gt; G = Everyone's an FA - & gt; Ga

But after reading Stephen Dahl's blog post, I find this:

A natural change in our context is associated with two Haskell Multifunction function is with Factor Instaners F and G Type Signature (Factor F, FencerG) => Fold AAF -> GA which can be written with the following types of options. 

  type nat f g = forall a F.A - & gt; For one who had a slap in the face of the attitude of "I am ignoring this" attitude of the person: why is the fact that the deficiency of the factor suddenly falls to a sudden fall is?

A barrier to a type of option is not allowed in Haskell and for datatype, Disliked in 2010. Instead, the obstacles should be kept on tasks that work on these types of values.


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