I'm curious if you get the same performance difference importing GHC.Listinstead of Data.Char? I chased some dependencies, and Data.Char imports GHC.Arr, which in turn imports GHC.List, which provides a bunch of fusion rules pragmas that would probably optimize your (++) usage. If this is the case, not sure if its a bug or not, but all this will have to be thought through as more stream fusion is rolled out anyway, I suspect? --S
_______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
