Object I/O causes GHC panic

[Krasimir Angelov]

      Hi

   The trouble is when uncomment lines 177-178 from
ObjectIO/WindowDispose.hs

For GHC-5.02.1
-------------------------------------------------------
ghc: panic! (the `impossible' happened, GHC version
5.02.1):
        coreSyn/CoreUtils.lhs:98: Non-exhaustive
patterns in function coreAltsTy
pe


Please report it as a compiler bug to
glasgow-haskell-bugs at haskell.org,
or http://sourceforge.net/projects/ghc/.
-------------------------------------------------------

For GHC-5.03 snapshot release
-------------------------------------------------------
ghc: panic! (the `impossible' happened, GHC version
5.03):
        Prelude.head: empty list

Please report it as a compiler bug to
glasgow-haskell-bugs at haskell.org,
or http://sourceforge.net/projects/ghc/.
-------------------------------------------------------

    How can I avoid this error?

Thanks

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