bpo-45449: add note about PEP 585 in collections.abc's documentation (GH-29047) (GH-29067)
Signed-off-by: Filipe Laíns <lains@riseup.net>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
(cherry picked from commit 7bafa0cf586227987d3d662264d491e3780024b7)
diff --git a/Doc/library/collections.abc.rst b/Doc/library/collections.abc.rst
index 0abc87f..2c941b4 100644
--- a/Doc/library/collections.abc.rst
+++ b/Doc/library/collections.abc.rst
@@ -104,6 +104,9 @@
``__iter__`` is insufficient for distinguishing a :class:`Sequence` from
a :class:`Mapping`.
+.. versionadded:: 3.9
+ These abstract classes now support ``[]``. See :ref:`types-genericalias`
+ and :pep:`585`.
.. _collections-abstract-base-classes:
diff --git a/Misc/NEWS.d/next/Documentation/2021-10-19-01-41-40.bpo-45449.fjHZJc.rst b/Misc/NEWS.d/next/Documentation/2021-10-19-01-41-40.bpo-45449.fjHZJc.rst
new file mode 100644
index 0000000..fb81775
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2021-10-19-01-41-40.bpo-45449.fjHZJc.rst
@@ -0,0 +1 @@
+Add note about :pep:`585` in :mod:`collections.abc`.
