GHC-6.4.1 much slower than GHC-6.4

[Mirko Rahn]

> I've found a way to speed up your code for ghc-6.4.1.
> Replace the "where" with a "case" in PCP.Suc.suc_rules (see below)

Okay, thanks, that works fine.

> (Maybe that is a good idea in PCP.Rules.Suc, too)

Seems to be unimportant whether the replacement is done in PCP.Rules.Suc 
too. In both cases the 6.4.1-version is slightly faster -- as is should 
be :-) -- than the 6.4.

> I don't know why this can be better optimized, but my profiling results 

I even don't understand why it works. I think I have to reread the 
report once more...

      Mirko

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