[Python-checkins] [3.9] gh-92049: Forbid pickling constants re._constants.SUCCESS etc (GH-92070) (GH-92073) (GH-92102)

[serhiy-storchaka]

https://github.com/python/cpython/commit/54f06aeb74909f6c3b0727e73987639732428751
commit: 54f06aeb74909f6c3b0727e73987639732428751
branch: 3.9
author: Serhiy Storchaka <storchaka at gmail.com>
committer: serhiy-storchaka <storchaka at gmail.com>
date: 2022-05-01T13:01:56+03:00
summary:

[3.9] gh-92049: Forbid pickling constants re._constants.SUCCESS etc (GH-92070) (GH-92073) (GH-92102)

Previously, pickling did not fail, but the result could not be unpickled.
(cherry picked from commit 6d0d547033e295f91f05030322acfbb0e280fc1f)
(cherry picked from commit e8ff3c92f69b475aa20ba7c08efccbc329f9b42e)

files:
A Misc/NEWS.d/next/Library/2022-04-30-10-53-10.gh-issue-92049.5SEKoh.rst
M Lib/sre_constants.py

diff --git a/Lib/sre_constants.py b/Lib/sre_constants.py
index 8e613cb3fa5dc..db3ca51e8306a 100644
--- a/Lib/sre_constants.py
+++ b/Lib/sre_constants.py
@@ -62,6 +62,8 @@ def __new__(cls, value, name):
     def __repr__(self):
         return self.name
 
+    __reduce__ = None
+
 MAXREPEAT = _NamedIntConstant(MAXREPEAT, 'MAXREPEAT')
 
 def _makecodes(names):
diff --git a/Misc/NEWS.d/next/Library/2022-04-30-10-53-10.gh-issue-92049.5SEKoh.rst b/Misc/NEWS.d/next/Library/2022-04-30-10-53-10.gh-issue-92049.5SEKoh.rst
new file mode 100644
index 0000000000000..cad4621c65096
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-04-30-10-53-10.gh-issue-92049.5SEKoh.rst
@@ -0,0 +1,2 @@
+Forbid pickling constants ``re._constants.SUCCESS`` etc. Previously,
+pickling did not fail, but the result could not be unpickled.