[GHC] #3990: UNPACK doesn't unbox data families

[GHC]

#3990: UNPACK doesn't unbox data families
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    Reporter:  rl                |       Owner:                         
        Type:  bug               |      Status:  new                    
    Priority:  low               |   Milestone:  7.6.2                  
   Component:  Compiler          |     Version:  7.0.3                  
    Keywords:                    |          Os:  Unknown/Multiple       
Architecture:  Unknown/Multiple  |     Failure:  Runtime performance bug
  Difficulty:  Unknown           |    Testcase:                         
   Blockedby:                    |    Blocking:                         
     Related:                    |  
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Changes (by simonpj):

  * difficulty:  => Unknown


Comment:

 See #7647 re polymorphic unpacking.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3990#comment:14>
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