Yes, that's it. We don't want an extra conditional test on every store, plus perhaps an array of bits to record which items have been filled. Simon | -----Original Message----- | From: haskell-bounces@haskell.org [mailto:haskell-bounces@haskell.org] On Behalf Of Iavor S. | Diatchki | Sent: 03 February 2004 18:23 | To: Wolfgang Jeltsch | Cc: The Haskell Mailing List | Subject: Re: [Haskell] RE: Hugs/GHC incompatibility | | hi, | i am speculating here, but i guess that if double initializations were to | result in _|_ one would have to check if a cell has already been | initialized, | and if so replace it with _|_. | currently ghc probably simply overwrites the array elements. | i personally prefer ghc's behavior. | -iavor | | Wolfgang Jeltsch wrote: | | >Am Dienstag, 3. Februar 2004 18:17 schrieb Simon Peyton-Jones: | > | > | >>>I think, I've found the problem. GHC seems to not implement | >>>Data.Array.array correctly. The implementation doesn't adhere to the | >>>following sentence from the Data.Array.IArray.array documentation: If any | >>>two associations in the list have the same index, the value at that index | >>>is undefined. | >>> | >>>Could this be fixed? | >>> | >>> | > | > | > | >>[...] | >> | >> | > | > | > | >>We don't intend to fix this because fixing it will have a significant | >>overhead on every array construction. | >> | >> | > | >Sorry, but I don't see where the overhead should come from. | > | > | > | >>[...] | >> | >> | > | > | > | >>Simon | >> | >> | > | >Wolfgang | > | >_______________________________________________ | >Haskell mailing list | >Haskell@haskell.org | >http://www.haskell.org/mailman/listinfo/haskell | > | > | | | -- | ================================================== | | Iavor S. Diatchki, Ph.D. student | | | Department of Computer Science and Engineering | | | School of OGI at OHSU | | | http://www.cse.ogi.edu/~diatchki | | ================================================== | | _______________________________________________ | Haskell mailing list | Haskell@haskell.org | http://www.haskell.org/mailman/listinfo/haskell