The third change removes the early uses of "object" from:
<quote> Finally, the closing(object)() function returns object so that it can be bound to a variable, and calls object.close at the end of the block. </quote>
leaving the last use (object.close) as a dangling reference.
So either revert this part of the fix and change :func:`closing(object)` to just ``closing(object)`` or follow up the present change by changing <quote> and calls :meth `object.close` at the end </quote> to <q> and calls the argument's :meth:`close` method at the end </q>