[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/contextlib.rst b/Doc/library/contextlib.rst
index 73b24e5..0aa4ad7 100644
--- a/Doc/library/contextlib.rst
+++ b/Doc/library/contextlib.rst
@@ -416,7 +416,7 @@
The passed in object is returned from the function, allowing this
method to be used as a function decorator.
- .. method:: callback(callback, *args, **kwds)
+ .. method:: callback(callback, /, *args, **kwds)
Accepts an arbitrary callback function and arguments and adds it to
the callback stack.
@@ -473,7 +473,7 @@
Similar to :meth:`push` but expects either an asynchronous context manager
or a coroutine function.
- .. method:: push_async_callback(callback, *args, **kwds)
+ .. method:: push_async_callback(callback, /, *args, **kwds)
Similar to :meth:`callback` but expects a coroutine function.