[GHC] #810: GHC complains about missing instance in conjunction with GADTs

[GHC]

#810: GHC complains about missing instance in conjunction with GADTs
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        Reporter:  wolfgang@…  |         Owner:  simonpj
            Type:  bug         |        Status:  closed
        Priority:  normal      |     Milestone:  6.8.1
       Component:  Compiler    |       Version:  6.4.1
      Resolution:  fixed       |      Keywords:
Operating System:  Linux       |  Architecture:  x86
      Difficulty:  Unknown     |     Test Case:  gadt20
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Comment (by Ian Lynagh <igloo@…>):

 In [changeset:"5a6c7d62ae6fe2f264b8734f91bd75c58c56600e/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="5a6c7d62ae6fe2f264b8734f91bd75c58c56600e"
 Add test gadt20 for trac #810 (GHC fails to find GADT instances)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/810#comment:9>
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