[GHC] #4042: Order of declarations affects the correctness of reported error.

[GHC]

#4042: Order of  declarations affects the correctness of reported error.
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    Reporter:  ChrisN             |        Owner:                                   
        Type:  bug                |       Status:  new                              
    Priority:  normal             |    Milestone:                                   
   Component:  Compiler (Parser)  |      Version:  6.12.2                           
    Keywords:                     |   Difficulty:                                   
          Os:  Linux              |     Testcase:                                   
Architecture:  Unknown/Multiple   |      Failure:  Incorrect warning at compile-time
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Comment(by simonmar):

 Oh, I just pressed submit and now I realise why this happens: it's because
 a TH splice divides the module in two, so things before the splice cannot
 refer to those afterwards.

 Simon: is there anything we can do to make the error message more useful
 here?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4042#comment:2>
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