Describe the bug

Running Black with Python 3.12 but targeting Python 3.14 on a file containing an except clause with multiple parenthesized exception types fails with an internal error.

To Reproduce

These steps:

python3.12 -m venv venv
source venv/bin/activate
pip install black
printf "%s\n" 'try:' ' 1 / 0' 'except (a, b):' ' pass' >test.py
black -t py314 test.py

result in this error:

error: cannot format test.py: INTERNAL ERROR:
Black 26.1.0 on Python (CPython) 3.12.11 produced invalid code:
multiple exception types must be parenthesized (<unknown>, line 3).
Please report a bug on https://github.com/psf/black/issues.
This invalid output might be helpful: /tmp/blk_t6kdrgtk.log

Oh no! 💥 💔 💥
1 file failed to reformat.

Expected behavior

No internal error (even if that means --fast has to be implied when targeting a different Python version?)

Environment

• Black's version: 26.1.0
• OS and Python version: Linux, Python 3.12.11