[PEAK] Type implications bug

Sergey Schetinin maluke at gmail.com
Wed Jul 16 01:22:18 EDT 2008

Phillip, can you please commit a fix for
If you need a test case it's "from peak.context import *"

Also, http://www.eby-sarna.com/pipermail/peak/2008-June/002990.html
needs some attention too, should I forward it to distutils-sig or
something like that?


On Tue, Jul 15, 2008 at 17:58, Phillip J. Eby <pje at telecommunity.com> wrote:
> At 12:23 PM 7/15/2008 +0200, Alberto Valverde wrote:
>> Hi,
>> I've attached a unit test which blows up peak/rules/indexing.py._get_mro.
> Hm.  There are actually two problems here.  First, issubclass() is being
> called on an object that's not a class or type, and that blows up the class
> lookup code.  The second is that isclass(x) isn't being tested before that,
> because direct tests on parameters are assumed to not require prerequisites
> to go first.  In other words, PEAK-Rules assumes that issubclass(x, ...) can
> go before any other test on x.
> This can be fixed by removing the predicates.always_testable() rule for
> IsSubclass criteria; then IsSubclass tests will not be moved in front of
> other criteria.  Doing issubclass() on a non-class/type object will still
> blow up, though.
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Best Regards,
Sergey Schetinin

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