Pre-proposal discussion: add a version of dropWhileEnd with different laziness properties to Data.List

Greg Weber greg at
Mon Sep 29 22:11:04 UTC 2014

Yep, I didn't understand what was going on. The fast version of find-conduit was using a raw file path

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On Mon, Sep 29, 2014 at 2:50 PM, Bardur Arantsson <spam at>

> On 2014-09-29 23:31, Greg Weber wrote:
>>>> Do you mean system-filepath [1]?
>>> No.  The api is ok, but performance is terrible because everything is a
>>> String.  Traversing large directories in Haskell is orders of magnitude
>>> slower than it should be (unless you use posix-paths, which obviously isn't
>>> portable).  I mean something that internally uses a RawFilePath on posix
>>> systems and some windows-specific thing on Windows.
>> I don't know how to reconcile this statement with how find-conduit was
>> benchmarked to operate about as fast as GNU grep since it uses
>> system-filepath. I am probably missing something important.
> I'm not seeing exactly what "grep" has to do with "find"...?
> Did you mean to compare GNU find with "find-conduit"?
> Regards,
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