bug (?) - unboxed tuples

Hello,
I recently read the following:
dafis@linux:~/Documents/pi3/diverses/Mascheroni> ghci Exponent.hs
   ___         ___ _
  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 6.2, for Haskell 98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base ... linking ... done.
Skipping  TheLog           ( ./TheLog.hs, ./TheLog.o )
Compiling Exponent         ( Exponent.hs, interpreted )
ghc-6.2: panic! (the `impossible' happened, GHC version 6.2):
        Bytecode generator can't handle unboxed tuples.  Possibly due
        to foreign import/export decls in source.  Workaround:
        compile this module to a .o file, then restart session.

The complete code of both modules is attached, as well as system information 
(I know not much about such things, so I can only hope that is helpful for 
you).

Compiling Exponent to a .o file did work, so there is no real problem.
However, ghci said 'Please report it as a compiler bug', so I am doing it.
Besides, there are no tuples at all in module Exponent, module TheLog, where 
there are a couple of tuples (are they unboxed though?) was compiled earlier,
so I don't understand the message. If you could spare the time to explain (or 
give a source for an explanation), I would be even more grateful than I am 
anyway (such a wonderful thing as ghc FOR FREE!!).

All the best to you,
Daniel Fischer

GHCError.txt
Description: Text document

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