[IronPython] bug when overriding __delattr__

[Ronnie Maor]

The following code works in CPython 2.6.2, but is broken in both IPy 2.6 and
2.6.1

>>> class A(object):
...     def __delattr__(self,name):
...             object.__delattr__(self,name)
...
>>> a = A()
>>> a.x = 3
>>> del a.x
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in __delattr__
AttributeError: 'A' object has no attribute 'x'
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