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[py] incref exception type before restoring it

--- a/python/lib/gen_code.py

+++ b/python/lib/gen_code.py

@@ -509,7 +509,10 @@

       // change the RuntimeError into ValueError

       PyObject *type, *value, *traceback;

       PyErr_Fetch(&type, &value, &traceback);

-      PyErr_Restore(PyExc_ValueError, value, traceback);

+      Py_XDECREF(type);

+      type = PyExc_ValueError;

+      Py_XINCREF(type);

+      PyErr_Restore(type, value, traceback);

     }}

     return NULL;

   }}