[GHC] #11148: T9563 doesn't pass with reversed uniques

[GHC]

#11148: T9563 doesn't pass with reversed uniques
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        Reporter:  niteria           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 I'm not immediately sure what's wrong, but it doesn't seem specific to
 `Generic1`. In fact, you can get the same error if you change `Generic1`
 to `Functor`, `Foldable`, or `Traversable`. It seems that something about
 typeclasses with kind `(* -> *) -> Constraint` triggers this, since I can
 derive `Eq`, `Ord`, `Read`, `Show`, `Data`, and `Lift` for `G Int b Float
 d` without any issue.

 Another clue is that `data instance F A a = AData a deriving Generic1`
 works fine, but `data instance F b a = AData a deriving Generic1` triggers
 this error, so you need at least one type variable in a data instance for
 this to happen. Perhaps the type variable in the data family declaration
 and the type variable in the data family instance have conflicting
 `Unique`s when reversed?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11148#comment:3>
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