[GHC] #12057: TypeFamilyDependencies on GHC.Generic's `Rep`

[GHC]

#12057: TypeFamilyDependencies on GHC.Generic's `Rep`
-------------------------------------+-------------------------------------
        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  8.0.1
      Resolution:                    |             Keywords:  TypeFamilies,
                                     |  Injective
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 Iceland_jack):

 `Data.Type.Bool.Not` can be made injective

 {{{#!hs
 type family Not (a :: Bool) = (res :: Bool) | res ->
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12057#comment:2>
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