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The init function of the locale module fails to check for errors in a couple of places. The patch replaces PyDict_SetItemString() calls with PyModule_AddIntMacro() and error checks. An exception is unlikely so I'm OK when the patch just lands in 3.4 and 3.5.
CID 1295027 (#8 of 8): Dereference null return value (NULL_RETURNS)
dereference: Dereferencing a pointer that might be null x when calling PyDict_SetItemString

A variant of localemodule.patch without error checking for PyModule_AddIntMacro() has been applied in https://github.com/python/cpython/commit/ff4fddde57d5579dff3a83d99e20cd06366b10d6.
Christian, can this be closed or do we still need to add error checking to all PyModule_AddIntMacro() usages?

This function now looks like this:
PyMODINIT_FUNC
PyInit__locale(void)
{
 return PyModuleDef_Init(&_localemodule);
}