[GHC] #7408: Do not warn on unused newtype constructors when used with FFI

[GHC]

#7408: Do not warn on unused newtype constructors when used with FFI
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  Reporter:  SimonHengel                     |          Owner:                  
      Type:  feature request                 |         Status:  closed          
  Priority:  normal                          |      Milestone:                  
 Component:  Compiler                        |        Version:  7.6.1           
Resolution:  fixed                           |       Keywords:                  
        Os:  Unknown/Multiple                |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown                    |     Difficulty:  Unknown         
  Testcase:  typecheck/should_compile/T7408  |      Blockedby:                  
  Blocking:                                  |        Related:                  
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Comment(by simonpj):

 When you say such nice things about GHC, it's hard to resist :-)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7408#comment:4>
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