[GHC] #2440: Bad code with type families

[GHC]

#2440: Bad code with type families
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    Reporter:  rl                |       Owner:                         
        Type:  bug               |      Status:  new                    
    Priority:  lowest            |   Milestone:  7.6.2                  
   Component:  Compiler          |     Version:  6.9                    
    Keywords:                    |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple  |     Failure:  Runtime performance bug
  Difficulty:  Unknown           |    Testcase:                         
   Blockedby:                    |    Blocking:                         
     Related:                    |  
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Comment(by morabbin):

 Since #2859 is closed as fixed, ought this be also?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2440#comment:19>
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