I support the proposal. -----Original Message----- From: libraries-bounces@haskell.org [mailto:libraries-bounces@haskell.org] On Behalf Of Christian Maeder Sent: 13 January 2011 19:12 To: Haskell Libraries Subject: Re: Proposal: keep Data.Map.foldWithKey Hi, it's time to come to a conclusion for this proposal. Two votes are currently against and basically just mine for it. Q: So why do I think it is unfortunate? A: 1. Because globally replacing foldWithKey by foldrWithKey will not work if you also use Data.IntMap. So, the symmetry to the twin-module Data.IntMap is lost. 2. The same deprecation procedure for Data.IntMap can only start after two major release from the current one (ghc-7.0) that does not allow further API changes. Major release ghc-7.2 is needed to add foldrWithKey to Data.IntMap and deprecation can follow in major release ghc-7.4. So foldWithKey can be finally deleted in ghc-7.6. Q: Why do I think it is urgent? 1. It is the easiest and fastest way to re-establish the symmetry between Data.Map and Data.IntMap. If we don't do it now, we'll have skew Data.Map and Data.IntMap modules for the next couple of major releases. 2. Therefore it should also not go as is into the next haskell platform (that'll soon come out). I regard the removal of the deprecation warning not as an API change of ghc-7.0. If you do then please regard the deprecation for ghc-7.0.1 as an accidental bug to be fixed for ghc-7.0.2. Seeing http://www.haskell.org/pipermail/libraries/2010-September/014161.html I wonder why "fold" was not deprecated together with "foldWithKey". Therefore I conclude that the decision to deprecate just "foldWithKey" was more or less an accident. So why do we deprecated just a single name that we do not get rid of soon anyway and confuse users that rightly expect consistent (Data.Map and Data.IntMap) APIs? Asking for support again (or withdrawals of "no"s) Christian Am 14.12.2010 13:28, schrieb Christian Maeder:
Hi,
I've now created a proper library proposal to keep Data.Map.foldWithKey. Exchange arguments and make up your mind until Jan. 15th.
http://hackage.haskell.org/trac/ghc/ticket/4842
Cheers Christian
_______________________________________________ Libraries mailing list Libraries@haskell.org http://www.haskell.org/mailman/listinfo/libraries =============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ===============================================================================