New issue 2199: Data Descriptors incorrectly implemented
https://bitbucket.org/pypy/pypy/issues/2199/data-descriptors-incorrectly-implemented
jacobz_20:
Consider the following descriptor:
```
#!python
class desc:
def __get__(self, instance, owner):
return "get"
def __delete__(self, instance):
print("delete")
```
Pypy seems to not consider this to be a data descriptor. Assigning a value to
an attribute of this descriptor type should raise an "AttributeError: __set__",
but it instead saves the value on the instance dictionary. Then, when the
attribute is looked up, it pulls it from the instance rather than calling
__get__().
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