AttributeError when copying flags in the re module. #93820
Description
Bug report
In CPython 3.11, I've noticed that an attempt to copy (combined) regular expression flags fails with an attribute error; like so:
>>> import copy, re
>>> copy.copy(re.A | re.I)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "lib/python3.11/copy.py", line 102, in copy
return _reconstruct(x, None, *rv)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "lib/python3.11/copy.py", line 265, in _reconstruct
y = func(*args)
^^^^^^^^^^^
File "lib/python3.11/enum.py", line 862, in __getattr__
raise AttributeError(name) from None
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: ASCII|IGNORECASE
Your environment
- CPython versions tested on: 3.11.0b3
- Operating system and architecture: macOS 10.15.7
Background
This behavior was detected from a CrossHair test failure here, in which we realize possibly symbolic arguments prior to regex compilation. (it's an esoteric use case, and I expect not very high priority)