[3.9] bpo-37116: Use PEP 570 syntax for positional-only parameters. (GH-12620)
Turn deprecation warnings added in 3.8 into TypeError.
diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index 5ec4b40..320d898 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -1427,7 +1427,7 @@
:class:`TextTestResult` in Python 3.2.
- .. method:: addCleanup(function, *args, **kwargs)
+ .. method:: addCleanup(function, /, *args, **kwargs)
Add a function to be called after :meth:`tearDown` to cleanup resources
used during the test. Functions will be called in reverse order to the