New issue 3055: Segfault when defining a C extension type with empty docstring
on PyPy3
https://bitbucket.org/pypy/pypy/issues/3055/segfault-when-defining-a-c-extension-type
timfel:
Given this type definition, we get a segfault when calling `PyType_Ready` on it:
```c
static PyTypeObject NativeType = {
PyVarObject_HEAD_INIT(NULL, 0)
"NativeType.NativeType",
sizeof(NativeTypeObject),
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
Py_TPFLAGS_DEFAULT,
"",
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
0,
PyType_GenericAlloc,
PyType_GenericNew,
PyObject_Del,
};
```
We can avoid the segfault if we give `0` or `NULL` instead of the empty
docstring in line 22. Or just adding any character to make the docstring longer
than 0-length also makes it work.
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