[GHC] #9968: DeriveAnyClass fails on multi-parameter type classes

[GHC]

#9968: DeriveAnyClass fails on multi-parameter type classes
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        Reporter:  goldfire          |                   Owner:  dreixel
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.10.1-rc1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #9821             |  Differential Revisions:
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Comment (by rwbarton):

 I think it's best to keep the simple rule: `data X = ... deriving (..., c,
 ...)` means to derive `c X` (here `c` is an application of a class
 constructor to zero or more types). After all if you want something else
 like `C X Bool` then you can express that with a standalone deriving
 declaration `deriving instance C X Bool`. Or in this case just write an
 empty instance, it's shorter :)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9968#comment:10>
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