New issue 2023: cpyext: PyDict_Keys/Values/Items() does not call type method
but instance method
https://bitbucket.org/pypy/pypy/issue/2023/cpyext-pydict_keys-values-items-does-not
sbehnel:
This is a somewhat special test case in Cython. Here is the code:
```
#!cython
class DictPySubtype(dict):
def keys(self):
"""
>>> d = DictPySubtype(one=42, two=17, three=0)
>>> for v in sorted(d.keys()):
... print(v)
three
two
"""
for key in dict.keys(self):
if key != 'one':
yield key
```
When executed in PyPy 2.5.1, I get an infinite recursion crash with C stack
traces like this:
```
#1111 0x00007ffff5887c02 in PyPyIter_Next () from
/home/stefan/ablage/software/Python/pypy-2.5.1-linux64/bin/libpypy-c.so
#1112 0x00007ffff000f211 in
__pyx_gb_27builtin_subtype_methods_cy3_13DictPySubtype_8generator2
(__pyx_generator=0x16653e0, __pyx_sent_value=0x7ffff6b6a0b0 <_PyPy_NoneStruct>)
at builtin_subtype_methods_cy3.c:1471
#1113 0x00007ffff0015ec0 in __Pyx_Generator_SendEx (self=0x16653e0,
value=0x7ffff6b6a0b0 <_PyPy_NoneStruct>) at builtin_subtype_methods_cy3.c:4768
#1114 0x00007ffff0016078 in __Pyx_Generator_Next (self=0x16653e0) at
builtin_subtype_methods_cy3.c:4811
```
This is because Cython translates "dict.keys(self)" into the CPython 2.x
equivalent "PyDict_Keys(self)". However, cpyext does not implement this C-API
function as "dict.keys(self)" but as "self.keys()", which then calls the
overridden method again and ends up in infinite recursion.
This might apply to other cpyext functions as well that delegate to methods of
builtin types.
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