GHC-6.4.1 much slower than GHC-6.4

[Mirko Rahn]

> It's a bug - we're looking into it.  Thanks for the report.

The file

http://liinwww.ira.uka.de/~rahn/bugCW/Body.hs

contains a small(er) piece of code that shows the behavior as well.
Just run make from

http://liinwww.ira.uka.de/~rahn/bugCW/Makefile

to get the *.prof files in

http://liinwww.ira.uka.de/~rahn/bugCW/

With ghc-6.4 is unimportant whether we use 'where' or 'case' syntax. In 
ghc-6.4.1 the 'where' syntax repeats some computation.

Hope it helps, regards, Mirko Rahn

--
-- Mirko Rahn -- Tel +49-721 608 7504 --
--- http://liinwww.ira.uka.de/~rahn/ ---