Proposal #3999: Improved folds for Data.Map and Data.IntMap

Louis Wasserman wasserman.louis at
Tue Apr 27 14:26:46 EDT 2010

Apologies, this is with 6.12.1.  The HEAD appears to work correctly, though.
 Will submit a bug report to double-check.

Louis Wasserman
wasserman.louis at

On Mon, Apr 26, 2010 at 10:26 PM, Roman Leshchinskiy <rl at>wrote:

> On 27/04/2010, at 03:20, Louis Wasserman wrote:
> > I'm not sure why you don't just use curry directly here. Also, why not
> just implement toAscList like in the rule and INLINE it?
> > I concede that using curry directly is the better approach, but when I
> implement toAscList as in the rule and inline it, it doesn't actually appear
> to get inlined.  (Example: mapKeysWith, which is defined as fromListWith c .
> fFirst . toList, doesn't actually fold/build with the map.)
> Is this with 6.12 or the HEAD? In any case, could you please submit a bug
> report so that Simon can have a look at it.
> Roman
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