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

[GHC]

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

 Does anyone have a way to make code work before and after the removal of
 pure from Arrow?  I import Arrow with "hiding (pure)" quite a lot, which
 is now required up to recent Arrow versions and forbidden after.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2517#comment:3>
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