[GHC] #3850: EmptyDataDecls and type context

[GHC]

#3850: EmptyDataDecls and type context
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    Reporter:  Paczesiowa        |        Owner:                           
        Type:  bug               |       Status:  new                      
    Priority:  normal            |    Milestone:                           
   Component:  Compiler          |      Version:  6.12.1                   
    Keywords:  emptydatadecls    |   Difficulty:                           
          Os:  Unknown/Multiple  |     Testcase:                           
Architecture:  Unknown/Multiple  |      Failure:  GHC rejects valid program
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Comment(by Paczesiowa):

 I don't have anything to do with this, maybe you should ask Oleg about
 such definition for labels.
 I just wanted to fix HList (it fails to compile with 6.12) and I've
 discovered, that 6.12 works different than 6.10 and also reports really
 misleading error message. So, I'm not interested in making this usage work
 like in 6.10, but there should be a better error message and some info in
 docs, that the behavior changed.

 Oleg's code: http://old-darcs.well-typed.com/HList/Data/HList/Label2.hs

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3850#comment:2>
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