[zope2-tracker] [Bug 1155760] [NEW] Wrapper_iter does not clear error on success

[Federico Schwindt]

Public bug reported:

_Acquisition.c's Wrapper_iter() doesn't call PyErr_Clear() if PyObject_GetAttr() failed but PySequence_Check() succeeded.
This causes mysterious "AttributeError: __iter__" on otherwise valid code. 

The following example shows the issue:

from Acquisition import Implicit
class C(Implicit):
    l = [0, 1, 2, 3, 4]
    def __getitem__(self, i):
        return self.l[i]
a = C()
b = C().__of__(a)
import time
try:
    for n in b:
        time.gmtime()
except AttributeError:
    raise

To fix it simply add the missing PyErr_Clear() after if
(PySequence_Check(obj)).

** Affects: zope2
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1155760

Title:
  Wrapper_iter does not clear error on success

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