[GHC] #4486: Unable to satisfy "Defined but not used: data constructor" warning

[GHC]

#4486: Unable to satisfy "Defined but not used: data constructor" warning
---------------------------+------------------------------------------------
  Reporter:  mitar         |          Owner:                  
      Type:  bug           |         Status:  closed          
  Priority:  normal        |      Milestone:  7.2.1           
 Component:  Compiler      |        Version:  6.12.3          
Resolution:  worksforme    |       Keywords:                  
  Testcase:                |      Blockedby:                  
Difficulty:                |             Os:  Unknown/Multiple
  Blocking:                |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown  |  
---------------------------+------------------------------------------------

Comment(by mitar):

 I also cannot reproduce it anymore. It seems to work correctly on a 7.1
 version.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4486#comment:3>
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