bpo-42198: Link to GenericAlias in typing and expressions (GH-23030)

Follow up to 7cdf30f and 4173320. This addresses the point "1. Update links in typing, subscription and union to point to GenericAlias." in the bpo for this PR.
(cherry picked from commit 9129af6)

Co-authored-by: kj <[email protected]>

Author: miss-islington

Doc/library/typing.rst

@@ -509,7 +509,8 @@ These can be used as types in annotations using ``[]``, each having a unique syn
    is equivalent to ``Tuple[Any, ...]``, and in turn to :class:`tuple`.
 
    .. deprecated:: 3.9
-      :class:`builtins.tuple <tuple>` now supports ``[]``. See :pep:`585`.
+      :class:`builtins.tuple <tuple>` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. data:: Union
 
@@ -583,7 +584,8 @@ These can be used as types in annotations using ``[]``, each having a unique syn
    :class:`collections.abc.Callable`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Callable` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Callable` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: Type(Generic[CT_co])
 
@@ -628,7 +630,8 @@ These can be used as types in annotations using ``[]``, each having a unique syn
    .. versionadded:: 3.5.2
 
    .. deprecated:: 3.9
-      :class:`builtins.type <type>` now supports ``[]``. See :pep:`585`.
+      :class:`builtins.type <type>` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. data:: Literal
 
@@ -1060,7 +1063,8 @@ Corresponding to built-in types
           ...
 
    .. deprecated:: 3.9
-      :class:`builtins.dict <dict>` now supports ``[]``. See :pep:`585`.
+      :class:`builtins.dict <dict>` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: List(list, MutableSequence[T])
 
@@ -1080,7 +1084,8 @@ Corresponding to built-in types
           return [item for item in vector if item > 0]
 
    .. deprecated:: 3.9
-      :class:`builtins.list <list>` now supports ``[]``. See :pep:`585`.
+      :class:`builtins.list <list>` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: Set(set, MutableSet[T])
 
@@ -1089,14 +1094,16 @@ Corresponding to built-in types
    to use an abstract collection type such as :class:`AbstractSet`.
 
    .. deprecated:: 3.9
-      :class:`builtins.set <set>` now supports ``[]``. See :pep:`585`.
+      :class:`builtins.set <set>` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: FrozenSet(frozenset, AbstractSet[T_co])
 
    A generic version of :class:`builtins.frozenset <frozenset>`.
 
    .. deprecated:: 3.9
-      :class:`builtins.frozenset <frozenset>` now supports ``[]``. See :pep:`585`.
+      :class:`builtins.frozenset <frozenset>` now supports ``[]``. See
+      :pep:`585` and :ref:`types-genericalias`.
 
 .. note:: :data:`Tuple` is a special form.
 
@@ -1110,7 +1117,8 @@ Corresponding to types in :mod:`collections`
    .. versionadded:: 3.5.2
 
    .. deprecated:: 3.9
-      :class:`collections.defaultdict` now supports ``[]``. See :pep:`585`.
+      :class:`collections.defaultdict` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: OrderedDict(collections.OrderedDict, MutableMapping[KT, VT])
 
@@ -1119,7 +1127,8 @@ Corresponding to types in :mod:`collections`
    .. versionadded:: 3.7.2
 
    .. deprecated:: 3.9
-      :class:`collections.OrderedDict` now supports ``[]``. See :pep:`585`.
+      :class:`collections.OrderedDict` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: ChainMap(collections.ChainMap, MutableMapping[KT, VT])
 
@@ -1129,7 +1138,8 @@ Corresponding to types in :mod:`collections`
    .. versionadded:: 3.6.1
 
    .. deprecated:: 3.9
-      :class:`collections.ChainMap` now supports ``[]``. See :pep:`585`.
+      :class:`collections.ChainMap` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: Counter(collections.Counter, Dict[T, int])
 
@@ -1139,7 +1149,8 @@ Corresponding to types in :mod:`collections`
    .. versionadded:: 3.6.1
 
    .. deprecated:: 3.9
-      :class:`collections.Counter` now supports ``[]``. See :pep:`585`.
+      :class:`collections.Counter` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: Deque(deque, MutableSequence[T])
 
@@ -1149,7 +1160,8 @@ Corresponding to types in :mod:`collections`
    .. versionadded:: 3.6.1
 
    .. deprecated:: 3.9
-      :class:`collections.deque` now supports ``[]``. See :pep:`585`.
+      :class:`collections.deque` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 Other concrete types
 """"""""""""""""""""
@@ -1174,7 +1186,8 @@ Other concrete types
    ``Match[bytes]``. These types are also in the ``typing.re`` namespace.
 
    .. deprecated:: 3.9
-      Classes ``Pattern`` and ``Match`` from :mod:`re` now support ``[]``. See :pep:`585`.
+      Classes ``Pattern`` and ``Match`` from :mod:`re` now support ``[]``.
+      See :pep:`585` and :ref:`types-genericalias`.
 
 .. class:: Text
 
@@ -1201,7 +1214,8 @@ Corresponding to collections in :mod:`collections.abc`
    A generic version of :class:`collections.abc.Set`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Set` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Set` now supports ``[]``. See :pep:`585` and
+      :ref:`types-genericalias`.
 
 .. class:: ByteString(Sequence[int])
 
@@ -1214,7 +1228,8 @@ Corresponding to collections in :mod:`collections.abc`
    annotate arguments of any of the types mentioned above.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.ByteString` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.ByteString` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Collection(Sized, Iterable[T_co], Container[T_co])
 
@@ -1223,28 +1238,32 @@ Corresponding to collections in :mod:`collections.abc`
    .. versionadded:: 3.6.0
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Collection` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Collection` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Container(Generic[T_co])
 
    A generic version of :class:`collections.abc.Container`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Container` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Container` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: ItemsView(MappingView, Generic[KT_co, VT_co])
 
    A generic version of :class:`collections.abc.ItemsView`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.ItemsView` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.ItemsView` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: KeysView(MappingView[KT_co], AbstractSet[KT_co])
 
    A generic version of :class:`collections.abc.KeysView`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.KeysView` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.KeysView` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Mapping(Sized, Collection[KT], Generic[VT_co])
 
@@ -1255,49 +1274,56 @@ Corresponding to collections in :mod:`collections.abc`
          return word_list[word]
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Mapping` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Mapping` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: MappingView(Sized, Iterable[T_co])
 
    A generic version of :class:`collections.abc.MappingView`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.MappingView` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.MappingView` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: MutableMapping(Mapping[KT, VT])
 
    A generic version of :class:`collections.abc.MutableMapping`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.MutableMapping` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.MutableMapping` now supports ``[]``. See
+      :pep:`585` and :ref:`types-genericalias`.
 
 .. class:: MutableSequence(Sequence[T])
 
    A generic version of :class:`collections.abc.MutableSequence`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.MutableSequence` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.MutableSequence` now supports ``[]``. See
+      :pep:`585` and :ref:`types-genericalias`.
 
 .. class:: MutableSet(AbstractSet[T])
 
    A generic version of :class:`collections.abc.MutableSet`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.MutableSet` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.MutableSet` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Sequence(Reversible[T_co], Collection[T_co])
 
    A generic version of :class:`collections.abc.Sequence`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Sequence` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Sequence` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: ValuesView(MappingView[VT_co])
 
    A generic version of :class:`collections.abc.ValuesView`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.ValuesView` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.ValuesView` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 Corresponding to other types in :mod:`collections.abc`
 """"""""""""""""""""""""""""""""""""""""""""""""""""""
@@ -1307,14 +1333,16 @@ Corresponding to other types in :mod:`collections.abc`
    A generic version of :class:`collections.abc.Iterable`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Iterable` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Iterable` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Iterator(Iterable[T_co])
 
    A generic version of :class:`collections.abc.Iterator`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Iterator` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Iterator` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Generator(Iterator[T_co], Generic[T_co, T_contra, V_co])
 
@@ -1348,7 +1376,8 @@ Corresponding to other types in :mod:`collections.abc`
               start += 1
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Generator` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Generator` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Hashable
 
@@ -1359,7 +1388,8 @@ Corresponding to other types in :mod:`collections.abc`
    A generic version of :class:`collections.abc.Reversible`.
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Reversible` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Reversible` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Sized
 
@@ -1384,7 +1414,8 @@ Asynchronous programming
    .. versionadded:: 3.5.3
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Coroutine` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Coroutine` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: AsyncGenerator(AsyncIterator[T_co], Generic[T_co, T_contra])
 
@@ -1420,7 +1451,8 @@ Asynchronous programming
    .. versionadded:: 3.6.1
 
    .. deprecated:: 3.9
-      :class:`collections.abc.AsyncGenerator` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.AsyncGenerator` now supports ``[]``. See
+      :pep:`585` and :ref:`types-genericalias`.
 
 .. class:: AsyncIterable(Generic[T_co])
 
@@ -1429,7 +1461,8 @@ Asynchronous programming
    .. versionadded:: 3.5.2
 
    .. deprecated:: 3.9
-      :class:`collections.abc.AsyncIterable` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.AsyncIterable` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: AsyncIterator(AsyncIterable[T_co])
 
@@ -1438,7 +1471,8 @@ Asynchronous programming
    .. versionadded:: 3.5.2
 
    .. deprecated:: 3.9
-      :class:`collections.abc.AsyncIterator` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.AsyncIterator` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 .. class:: Awaitable(Generic[T_co])
 
@@ -1447,7 +1481,8 @@ Asynchronous programming
    .. versionadded:: 3.5.2
 
    .. deprecated:: 3.9
-      :class:`collections.abc.Awaitable` now supports ``[]``. See :pep:`585`.
+      :class:`collections.abc.Awaitable` now supports ``[]``. See :pep:`585`
+      and :ref:`types-genericalias`.
 
 
 Context manager types
@@ -1461,7 +1496,8 @@ Context manager types
    .. versionadded:: 3.6.0
 
    .. deprecated:: 3.9
-      :class:`contextlib.AbstractContextManager` now supports ``[]``. See :pep:`585`.
+      :class:`contextlib.AbstractContextManager` now supports ``[]``. See
+      :pep:`585` and :ref:`types-genericalias`.
 
 .. class:: AsyncContextManager(Generic[T_co])
 
@@ -1471,7 +1507,8 @@ Context manager types
    .. versionadded:: 3.6.2
 
    .. deprecated:: 3.9
-      :class:`contextlib.AbstractAsyncContextManager` now supports ``[]``. See :pep:`585`.
+      :class:`contextlib.AbstractAsyncContextManager` now supports ``[]``. See
+      :pep:`585` and :ref:`types-genericalias`.
 
 Protocols
 ---------

Doc/reference/expressions.rst

@@ -837,14 +837,8 @@ this method will need to explicitly add that support.
 A string's items are characters.  A character is not a separate data type but a
 string of exactly one character.
 
-..
-   At the time of writing this, there is no documentation for generic alias
-   or PEP 585.  Thus the link currently points to PEP 585 itself.
-   Please change the link for generic alias to reference the correct
-   documentation once documentation for PEP 585 becomes available.
-
 Subscription of certain :term:`classes <class>` or :term:`types <type>`
-creates a `generic alias <https://www.python.org/dev/peps/pep-0585/>`_.
+creates a :ref:`generic alias <types-genericalias>`.
 In this case, user-defined classes can support subscription by providing a
 :meth:`__class_getitem__` classmethod.