Re: Proposal: unify constant functors

On Mon, Apr 30, 2012 at 10:55:51AM +0100, Bas van Dijk wrote:

On 30 April 2012 07:33, wren ng thornton wrote:

...

   (1) add the Foldable and Traversable instances to base, and

+1

...

   (2) deprecate transformers:Data.Functor.Constant

+1.

I assume you want to re-export Control.Applicative.Constant from Data.Functor.Constant and deprecate the whole module as in:

module Data.Functor.Constant {-# DEPRECATED "Import Constant from Control.Applicative instead" #-} ( Constant(..) ) where

import Control.Applicative

Not quite, as the one in Control.Applicative is called Const and the one in Data.Functor.Constant is called Constant. I slightly prefer the full name. Maybe just move Data.Functor.Constant into base (removing the copy in Control.Applicative)?