[GHC] #8204: Impossible when deriving Read for empty data declaration

[GHC]

#8204: Impossible when deriving Read for empty data declaration
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        Reporter:  tinctorius        |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by tinctorius):

 Of course I mean
 {{{
 -- Ugh, fine...
 {-# LANGUAGE StandaloneDeriving #-}
 data X
 deriving instance Read X
 main :: IO ()
 main = return ()
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8204#comment:1>
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