Comment 16 for bug 98382

Very good point. I retract my concern. It's appropriate for formlib. FWIW:

gary@posterboard:~ $ ./bin/zopectl debug
>>> root['hello'] = 'there'
>>> import transaction
>>> sp = transaction.savepoint()
>>> root['foo'] = 'bar'
>>> transaction.abort()
>>> root.get('foo')
>>> root.get('hello')
>>> sp.rollback()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/home/gary/classifieds/var/src/zope3/src/transaction/_transaction.py", line 744, in rollback
    raise interfaces.InvalidSavepointRollbackError
transaction.interfaces.InvalidSavepointRollbackError