[GHC] #3118: ghc: panic! (the 'impossible' happened): Missing alternative

[GHC]

#3118: ghc: panic! (the 'impossible' happened): Missing alternative
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    Reporter:  calvins         |        Owner:         
        Type:  bug             |       Status:  new    
    Priority:  normal          |    Milestone:         
   Component:  Compiler        |      Version:  6.10.1 
    Severity:  normal          |   Resolution:         
    Keywords:                  |   Difficulty:  Unknown
    Testcase:                  |           Os:  Linux  
Architecture:  x86_64 (amd64)  |  
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Comment (by calvins):

 Hmmm, that's odd. The
 [http://hackage.haskell.org/packages/archive/HTTP/4000.0.4/HTTP.cabal
 cabal file for HTTP-4004.0.4] doesn't list a version for parsec, and my
 package manager (on Gentoo) does not list a required version for parsec
 either.

 I will try uninstalling things and reinstalling using cabal-install rather
 than my package manager, and will report back.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3118#comment:3>
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