Data.Functor module naming?

[Ross Paterson]

On Mon, Nov 08, 2010 at 11:37:38PM +0000, Duncan Coutts wrote:
> On 8 November 2010 22:55, Daniel Peebles <pumpkingod at gmail.com> wrote:
> > Hi all,
> > I was wondering if anyone knew the rationale behind naming the module
> > Data.Functor instead of the (seemingly) more natural Control.Functor.
> 
> I'm not sure if it answers your question, but it goes along with
> Applicative living under the Data, not Control hierarchy.

Actually there is Control.Applicative, but Data.Foldable and
Data.Traversable.

I guess the answer is that functors include control-like things like
monads and applicative functors, but also data-like things like trees
and maps.