[GHC] #8175: Applicative instances for Ghc monad

[GHC]

#8175: Applicative instances for Ghc monad
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       Reporter:  DaniilFrumin      |             Owner:
           Type:  bug               |            Status:  new
       Priority:  lowest            |         Milestone:
      Component:  GHC API           |           Version:  7.7
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 Hello,

 I propose the following change:
 Adding Applicative instances for Ghc monad and GhcT monad transformer:
 https://github.com/co-dan/ghc/compare/ghcapplicative?
 This can be useful, for example, in GHC API.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8175>
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