panic in ghc5.02.3

[George Russell]

(This is on sparc-solaris)

# /usr/local/pub-bkb/ghc/ghc-latest/bin/ghc --make resources/GUIValue.hs resources/Colour.hs -fglasgow-exts 
ghc-5.02.3: chasing modules from: resources/GUIValue.hs,resources/Colour.hs
Compiling GUIValue         ( resources/GUIValue.hs, resources/GUIValue.o )
Compiling Colour           ( resources/Colour.hs, resources/Colour.o )
ghc-5.02.3: panic! (the `impossible' happened, GHC version 5.02.3):
        Maybe.fromJust: Nothing

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

Is there a workaround, or am I going to have to go back to ghc5.02.2?

Personally I suspect multi-parameter type-classes
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