#74: Data.Word64: arithmetic overflow when evaluating maxBound + 1 ---------------------------------------------------+------------------------ Reporter: guest | Owner: nobody Type: defect | Status: new Priority: major | Milestone: Component: hugs | Version: 200609 Keywords: Data.Word.Word64, arithmetic overflow | ---------------------------------------------------+------------------------ The function (fromInteger x) in Num(Data.Word.Word64) causes a program error, if x is greater or equal 2^64^. This is particularly annoying when two valid Word64 variables are to be multiplied. Take for instance {{{ Data.Word> maxbound :: Word64 18446744073709551615 Data.Word> 2*(2^63) :: Word64 Program error: arithmetic overflow Data.Word> (2^64) :: Word64 Program error: arithmetic overflow }}} GHC and GHCi return values mod 2^64^, as Hugs does also for Word32 and 2^32^. -- Ticket URL: http://hackage.haskell.org/trac/hugs/ticket/74 Hugs http://www.haskell.org/hugs/ Hugs 98, an interpreter for Haskell