[GHC] #4124: GHC rejects instance quotations with splices in the instance head

[GHC]

#4124: GHC rejects instance quotations with splices in the instance head
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    Reporter:  lilac             |        Owner:                           
        Type:  bug               |       Status:  new                      
    Priority:  normal            |    Milestone:  6.14.1                   
   Component:  Template Haskell  |      Version:  6.12.1                   
    Keywords:                    |   Difficulty:                           
          Os:  Unknown/Multiple  |     Testcase:                           
Architecture:  Unknown/Multiple  |      Failure:  GHC rejects valid program
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Comment(by igloo):

 I've fixed the pretty-printer so that it doesn't print `$[t| X |]`.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4124#comment:3>
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