[GHC] #930: ghc-6.6: panic! (the 'impossible' happened) mkWWcpr: not a product GHC-Brian-6.5.1:IdInfo.IdInfo{tc rfD}

[GHC]

#930: ghc-6.6: panic! (the 'impossible' happened) mkWWcpr: not a product GHC-
Brian-6.5.1:IdInfo.IdInfo{tc rfD}
---------------------------+------------------------------------------------
    Reporter:  briansmith  |        Owner:         
        Type:  bug         |       Status:  new    
    Priority:  normal      |    Milestone:         
   Component:  Compiler    |      Version:  6.5    
    Severity:  normal      |     Keywords:         
          Os:  Unknown     |   Difficulty:  Unknown
Architecture:  Unknown     |  
---------------------------+------------------------------------------------
I receive this message:
 {{{
 ghc-6.6: panic! (the 'impossible' happened)
   (GHC version 6.6 for i386-unknown-linux):
         mkWWcpr: not a product GHC-Brian-6.5.1:IdInfo.IdInfo{tc rfD}

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}
 I am using GHC from the 6.6 branch (pulled & built today).

 I am building the GHC API using the Cabal file that is attached. To use
 it, put the Cabal file and Setup.lhs in ghc/compiler/ along and run:
 {{{
 runhaskell Setup.lhs configure --with-hc=/path/to/ghc-6.6/compiler/stage2
 /ghc-inplace --with-hc-pkg=/path/to/ghc-6.6/utils/ghc-pkg/ghc-pkg-inplace
 runhaskell Setup.lhs build
 }}}
 It takes a long time because TidyPgm is module 215 of 274. When the "-O2"
 option is removed from the Cabal file, it builds and works fine.

 This was on Ubuntu 6.06.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/930>
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