Adding a newtype EndoCategory to Control.Category (ticket #3362)

[Ross Paterson]

On Wed, Jul 08, 2009 at 10:05:31PM -0400, roconnor at theorem.ca wrote:
>> The only packages on hackage containing instances for Endo are:
>>
>>  base
>>  HStringTemplate
>>  monoids
>>  special-functors
>>  TypeCompose
>
> Is this few enough that we can make our change?

The following additional packages use the current structure of Endo,
which would change:

  collections
  explicit-exception
  future
  happs-hsp-template
  happstack-server
  lhc
  midi
  monad-ran
  phooey
  storablevector
  synthesizer
  synthesizer-core
  xmonad
  xmonad-contrib
  yi