Bug in Parsec.Token

Antoine Latter aslatter at gmail.com
Wed Feb 17 07:24:14 EST 2010

On Wed, Feb 17, 2010 at 1:44 AM, Sittampalam, Ganesh
<ganesh.sittampalam at credit-suisse.com> wrote:
> Don Stewart wrote:
>> garious:
>>>> I've applied the 2.1 patch to
>>>>    http://darcs.haskell.org/old-from-monk/parsec/
>>>> but I think that is unmaintained now.
>>> Thanks Ian!
>>> Unmaintained, eh?  Are people migrating to Parsec 3.0?  Last
>>> discussion I heard about that (many months ago), Parsec 3.0 had some
>>> performance issues when used as a drop-in replacement for 2.1.  I
>>> notice that Haskell Platform ships with 2.1 and that the RWH chapter
>>> stays within the subset of 2.1.  Anyone know if the Haskell Platform
>>> is changing to 3.0 in the next release?
>> The gitit team *won't move to parsec 3 because it is too slow*.
> I thought someone recently had a look at the performance of parsec 3 and
> managed to get it pretty much the same as that of parsec 2?
> http://www.haskell.org/pipermail/haskell-cafe/2009-December/070196.html
> The main obstacle to applying the work seemed to be that the author was
> worried about having made a fundamental data structure change in the
> process of switching to CPS.

I've managed to convince myself that what I'm doing is good over here:

For what it's worth.


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