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SF bug #425836: Reference leak in filter().
Mark Hammond claimed that the iterized filter() forgot to decref the iterator upon return. He was right!
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@ -264,6 +264,7 @@ builtin_filter(PyObject *self, PyObject *args)
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if (j < len && PyList_SetSlice(result, j, len, NULL) < 0)
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goto Fail_result_it;
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Py_DECREF(it);
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return result;
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Fail_result_it:
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