[GHC] #786: bugs around tagToEnum#

[GHC]

#786: bugs around tagToEnum#
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  Reporter:  Bulat.Ziganshin at gmail.com  |          Owner:         
      Type:  bug                        |         Status:  new    
  Priority:  normal                     |      Milestone:         
 Component:  Compiler                   |        Version:  6.4.2  
  Severity:  normal                     |     Resolution:         
  Keywords:                             |             Os:  Unknown
Difficulty:  Unknown                    |   Architecture:  Unknown
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Comment (by simonmar):

 Unboxable2.hs bug fixed.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/786>
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