Bug report.

MR K P SCHUPKE k.schupke at imperial.ac.uk
Thu Mar 25 09:03:39 EST 2004

Started getting:

ghc- panic! (the `impossible' happened, GHC version
        mkTyVar a1 {- tv a75q -}

Please report it as a compiler bug to glasgow-haskell-bugs at haskell.org,
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.


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