On Wed, Jun 3, 2009 at 8:42 AM, Daniel Fischer <daniel.is.fisc...@web.de>wrote:
> Am Mittwoch 03 Juni 2009 06:12:46 schrieb Michael Snoyman: > > > I made two changes: > > > > 1. You had the arguments to M.lookup backwards. > > 2. lookup does not return any generalized Monad, just Maybe (I think that > > should be changed). > > Data.Map.lookup used to return a value in any monad you wanted, I believe > until 6.8 > inclusive. > I don't think it's going to change again soon. > Is there a reason why it only returns in the Maybe monad? I often times have to write a liftMaybe function to deal with that. Michael
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