On Tue, Dec 08, 2009 at 12:45:59AM +0800, L.Guo wrote: > 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]]
This looks like the right result to me. What makes you think it is wrong? What result do you expect? -Brent _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
