Could it not be a bug in a) printf b) unsafePerformIO c) >> d) return e) <= f) show g) GHC or GHCi?
All of the above? Best wishes Stephen 2009/12/7 L.Guo <leaveye....@gmail.com>: > Hi there: > > My friend asked me a question, and i suppose he has found a bug of `groupBy'. > > Here is the code piece: > >> List.groupBy (\a b -> Foreign.unsafePerformIO (Text.Printf.printf "\t%d <= >> %d ?: %s\n" a b (show (a<=b)) >> return (a<=b))) [7,3,5,9,6,8,3,5,4] > > I have tested it in GHC 6.10.4 (Win XP) and GHC 6.8.3 (Linux), both give the > wrong result (categaried): > > 7 <= 3 ?: False > 3 <= 5 ?: True > 3 <= 9 ?: True > 3 <= 6 ?: True > 3 <= 8 ?: True > 3 <= 3 ?: True > 3 <= 5 ?: True > 3 <= 4 ?: True > [[7],[3,5,9,6,8,3,5,4]] > > > Regards > -------------- > L.Guo > 2009-12-08 > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
