[GHC] #2517: remove 'pure' method from Arrow class

[GHC]

#2517: remove 'pure' method from Arrow class
----------------------------+-----------------------------------------------
 Reporter:  ross            |          Owner:         
     Type:  proposal        |         Status:  new    
 Priority:  normal          |      Milestone:  Not GHC
Component:  libraries/base  |        Version:         
 Severity:  normal          |     Resolution:         
 Keywords:                  |     Difficulty:  Unknown
 Testcase:                  |   Architecture:  Unknown
       Os:  Unknown         |  
----------------------------+-----------------------------------------------
Changes (by igloo):

  * difficulty:  => Unknown
  * milestone:  => Not GHC

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2517#comment:1>
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