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

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.

Trac metadata

Trac field	Value
Version	6.5
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown