[GHC] #4302: Impossible when deriving empty data declaration

[GHC]

#4302: Impossible when deriving empty data declaration
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        Reporter:  mitar             |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  7.4.1
       Component:  Compiler          |              Version:  6.12.3
      Resolution:  fixed             |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
                                     |  (amd64)
 Type of failure:  None/Unknown      |            Test Case:
                                     |  deriving/should_compile/T4302
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 commit 2fc5aa708982a414235d3aff68dea4329b546063
 {{{
 Author: simonpj at microsoft.com <unknown>
 Date:   Mon Sep 13 17:03:55 2010 +0000

     Fix Trac #4302, plus a little refactoring
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4302#comment:3>
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