> Started getting:
>
> ghc-6.2.1.20040313: panic! (the `impossible' happened, GHC
> version 6.2.1.20040313):
> mkTyVar a1 {- tv a75q -}
>
> Please report it as a compiler bug to
> [EMAIL PROTECTED],
> or http://sourceforge.net/projects/ghc/.
>
> today... definitely a but to do with class inference, as it
> started appearing
> aftyer changing some instance constraints and fundeps on classes.
>
> Can't really be a lot more specific as code is big. Let me
> know if you want
> me to produce a small code extract which triggers it.
Could you send us enough code to reproduce the bug? The smaller the
better, but don't worry if you can't reduce it.
Cheers,
Simon
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