QuickCheck failures with new 'tar' release...

Michael Snoyman michael at snoyman.com
Thu Jul 9 21:27:39 UTC 2015

I ran into the same thing with Stackage and filed the issue here:


Stackage is not accepting the new tar version due to these failures.

On Thu, Jul 9, 2015 at 2:26 PM Michael Alan Dorman <mdorman at ironicdesign.com>

> I'm not sure if there's a more appropriate venue to bring this up; the
> package doesn't seem to have any sort of explicit issue tracker.
> On the NixOS build servers, we're seeing across-the-board failures for
> the release of the 'tar' library, specifically, two properties
> that were added in the latest release.
> It looks to me like prop_lookup is fundamentally broken---it falls over
> in the face of a lookup for 'a/b' in a list of entries that includes
> 'a/b/c/d', because while the library lookup function returns a match
> including the remainder of the path as a result, the Data.List.lookup
> that it's comparing against returns nothing.
> I don't see a way for the test as it is constituted to work reliably.
> I'm going to guess that prop_valid suffers from a similar issue.
> Either way, it would be nice if they could either be corrected, or diked
> out until that happens.
> Mike.
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