[GHC] #5770: Non-sensical error message when compiling with PolyKinds and a type family

[GHC]

#5770: Non-sensical error message when compiling with PolyKinds and a type family
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    Reporter:  goldfire                 |       Owner:  dreixel                  
        Type:  bug                      |      Status:  new                      
    Priority:  high                     |   Milestone:  7.6.1                    
   Component:  Compiler (Type checker)  |     Version:  7.4.1-rc1                
    Keywords:  PolyKinds                |          Os:  Unknown/Multiple         
Architecture:  Unknown/Multiple         |     Failure:  GHC rejects valid program
  Difficulty:  Unknown                  |    Testcase:                           
   Blockedby:                           |    Blocking:                           
     Related:  #5717                    |  
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Changes (by simonpj):

  * milestone:  7.4.2 => 7.6.1


Comment:

 Moving to 7.6.1; !PolyKinds is not advertised as working in 7.4, and
 merging fixes will be too destablising.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5770#comment:5>
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