[GHC] #7981: Lack of packages from category theory at Platform

[GHC]

#7981: Lack of packages from category theory at Platform
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Reporter:  wvv               |          Owner:                  
    Type:  feature request   |         Status:  new             
Priority:  normal            |      Component:  libraries/base  
 Version:  7.6.3             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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 There are lack of basics packages from category theory at Platform.

 Some Functors (Contvariant, Profunctors), Group (Groupoids,
 Semigroupoids), Comonads, some Monads.

 Most of them are collected here:
 http://hackage.haskell.org/package/category-extras

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7981>
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