[GHC] #8003: Add missing Applicative/Alternative instances (AMP phase 1)

[GHC]

#8003: Add missing Applicative/Alternative instances (AMP phase 1)
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Reporter:  quchen            |          Owner:                  
    Type:  task              |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  7.6.3             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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 Add Functor/Applicative/Alternative instances to GHC's source where they
 are missing to fit the new hierarchy, namely `Functor => Applicative =>
 Monad` and `(Alternative, Monad) => MonadPlus`.

 (#4834 did something similar for a past GHC version, which is maybe
 helpful here.)



 This is part of phase 1 of the Applicative/Monad proposal (AMP), as
 discussed on the mailing lists [1]; a more detailed description of the AMP
 is available on the Wiki [2].

 [1]: [http://article.gmane.org/gmane.comp.lang.haskell.libraries/19482]
 [2]: [http://www.haskell.org/haskellwiki/Functor-Applicative-
 Monad_Proposal]

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/8003>
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