[GHC] #3908: "Defined but not used" for variable used in Template Haskell splice

[GHC]

#3908: "Defined but not used" for variable used in Template Haskell splice
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    Reporter:  josh              |       Owner:                                   
        Type:  bug               |      Status:  new                              
    Priority:  normal            |   Component:  Compiler                         
     Version:  6.12.1            |    Keywords:                                   
          Os:  Unknown/Multiple  |    Testcase:                                   
Architecture:  Unknown/Multiple  |     Failure:  Incorrect warning at compile-time
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Comment(by JakeWheat):

 I'm pretty sure it's the same bug as #3873, this seems to consistently
 happen whenever  a variable is only referenced inside a quotation.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3908#comment:1>
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