Arch linux's ghc package was upgraded to 7.0.2 this weekend. I unregistered all cabal packages, removed ~/.cabal/packages/*/* and ~/.ghc in an effort to start fresh.

I successfully installed quite a few packages via cabal install.

You can find my current ghc-pkg list here.

At cabal install yesod, I get the following:

...
Loading package MonadCatchIO-mtl-0.3.0.2 ... linking ... done.
Loading package Cabal-1.10.1.0 ... linking ... done.
Loading package ghc-binary-0.5.0.2 ... linking ... done.
Loading package bin-package-db-0.0.0.0 ... linking ... done.
Loading package hpc-0.5.0.6 ... linking ... done.
Loading package ghc-7.0.2 ... ghc: This ELF file contains no symtab
ghc: panic! (the 'impossible' happened)
  (GHC version 7.0.2 for x86_64-unknown-linux):
        loadArchive "/usr/lib/ghc-7.0.2/ghc-7.0.2/libHSghc-7.0.2.a": failed

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

cabal: Error: some packages failed to install:
yesod-0.7.1 failed during the building phase. The exception was:
ExitFailure 1

I'm reporting here because I was specifically asked to by ghc (I almost always assume these things are my fault), please let me know what additional info you would like in this report.

Thanks.