[GHC] #1255: UNPACKing a !Foo with newtype Foo = (Ptr Foo) causes the impossible

[GHC]

#1255: UNPACKing a !Foo with newtype Foo = (Ptr Foo) causes the impossible
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 Reporter:  rashakil                  |          Owner:         
     Type:  bug                       |         Status:  new    
 Priority:  normal                    |      Milestone:         
Component:  Compiler                  |        Version:  6.6    
 Severity:  normal                    |     Resolution:         
 Keywords:  UNPACK unbox newtype Ptr  |     Difficulty:  Unknown
 Testcase:                            |   Architecture:  x86    
       Os:  Linux                     |  
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Comment (by stefanor at cox.net <Stefan O'Rear>):

 Datapoint: This works correctly (well, -dcore-lint clean) on HEAD with the
 new newtype system.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1255>
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