Blame for Python/train/3.13/exception-groups/modern_22.py

eg = ExceptionGroup("eg", [TypeError(12)])
eg.foo = 'foo'
try:
    raise eg
except* TypeError as e:
    e.foo = 'bar'
#   ^----------- ``e`` is an ephemeral object that might get
#                      destroyed after the ``except*`` clause.
eg.foo