[GHC] #1935: deriving data doesn't work for phantom types

[GHC]

#1935: deriving data doesn't work for phantom types
----------------------+-----------------------------------------------------
 Reporter:  alex      |          Owner:         
     Type:  bug       |         Status:  new    
 Priority:  normal    |      Milestone:  6.8.2  
Component:  Compiler  |        Version:  6.8.1  
 Severity:  normal    |       Keywords:         
 Testcase:            |   Architecture:  Unknown
       Os:  Unknown   |  
----------------------+-----------------------------------------------------
 e.g.

 data Foo a = Foo

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1935>
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