[issue16445] SEGFAULT when deleting Exception.message

[STINNER Victor]

STINNER Victor added the comment:

py_clear.spatch	replaces:
  Py_DECREF(obj->attr); obj->attr = NULL;
but also:
  Py_DECREF(obj); obj = NULL;

If the second pattern is not dangerous, py_clear.spatch can be modified to only match the first pattern: see py_decref_replace.spatch of issue #16447 for an example.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16445>
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