[GHC] #4076: Add Applicative instance for STM

[GHC]

#4076: Add Applicative instance for STM
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    Reporter:  basvandijk        |       Owner:                
        Type:  proposal          |      Status:  new           
    Priority:  normal            |   Component:  libraries/base
     Version:  6.12.2            |    Keywords:                
          Os:  Unknown/Multiple  |    Testcase:                
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown  
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Comment(by basvandijk):

 In the discussion on the libraries list Ross Paterson suggested moving the
 MonadPlus instance for STM from Control.Monad.STM to GHC.Conc to avoid an
 orphaned instance. I created ticket #4077 for this (including patches)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4076#comment:2>
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