New issue 2788: cpyext: writing readonly attribute raises TypeError instead of
AttributeError
https://bitbucket.org/pypy/pypy/issues/2788/cpyext-writing-readonly-attribute-raises
Christoph Reiter:
An attribute defined through tp_getset with a PyGetSetDef struct where the
attribute entry has a NULL setter leads to the following differences:
CPython:
```
#!python
Traceback (most recent call last): File "a.py", line 3, in <module>
GObject.TYPE_STRING.name = "foo" AttributeError: attribute 'name' of
'gobject.GType' objects is not writable
```
PyPy:
```
#!python
Traceback (most recent call last):
File "a.py", line 3, in <module>
GObject.TYPE_STRING.name = "foo"
TypeError: readonly attribute
```
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