[GHC] #9600: Bad error message: Applicative is not a derivable class

[GHC]

#9600: Bad error message: Applicative is not a derivable class
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              Reporter:  nh2         |            Owner:  JohnWiegley
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:  7.10.1
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Easy (less than 1
       Type of failure:              |  hour)
  None/Unknown                       |       Blocked By:
             Test Case:              |  Related Tickets:
              Blocking:              |
Differential Revisions:              |
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Comment (by JohnWiegley):

 Fix pending review: https://phabricator.haskell.org/D216

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9600#comment:2>
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