That's this bit:
```
except (A, B):
^^^^^^
```
bpo-43149 currently calls it an "exception group", but that conflicts with PEP
654 -- Exception Groups and except*
```
>>> try:
... pass
... except A, B:
... pass
Traceback (most recent call last):
SyntaxError: exception group must be parenthesized
```
some alternatives:
exception classinfo must be parenthesized (classinfo so named from the
parameter to issubclass)
exception sequence must be parenthesized
see also:
- https://github.com/python/cpython/pull/24467#discussion_r628756347
- https://www.python.org/dev/peps/pep-0654/
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