Sync pre-release CPython 3.15 branch from GitHub (2026-08-06)

Summary:
Imported python/cpython `3.15.0rc1+dev` from upstream rev [`606df1b`](https://www.github.com/python/cpython/commit/606df1be0b910f8bd2c06fe0478f20c77c0908a4) (committed 2026-08-06 13:11:16+00:00).

# Commit Info

- Base: (`3.15.0rc1+dev`) - [`f20b504`](https://www.github.com/python/cpython/commit/f20b504b17d1b35a1404b80ff3578dc9e4762660) (commit date: 2026-08-05 09:14:03+00:00)
- Imported: (`3.15.0rc1+dev`) - [`606df1b`](https://www.github.com/python/cpython/commit/606df1be0b910f8bd2c06fe0478f20c77c0908a4) (commit date: 2026-08-06 13:11:16+00:00)

Reviewed By: itamaro

Differential Revision: D115155248

fbshipit-source-id: 7b24e7d261a47ece6919c93826289c7634807d29

Author: generatedunixname1734921407115435

Doc/library/ast.rst

@@ -806,7 +806,8 @@ Comprehensions
    List and set comprehensions, generator expressions, and dictionary
    comprehensions. ``elt`` (or ``key`` and ``value``) is a single node
    representing the part that will be evaluated for each item.
-
+   For dictionary comprehensions using unpacking, for example
+   ``{**item for item in items}``, ``value`` is ``None``,
    ``generators`` is a list of :class:`comprehension` nodes.
 
    .. doctest::

Doc/tools/templates/indexcontent.html

@@ -82,10 +82,16 @@ <h1>{{ docstitle|e }}</h1>
   <p><strong>{% trans %}Other resources:{% endtrans %}</strong></p>
   <div class="contentstable">
     <ul>
+      <li class="biglink"><a class="biglink" href="https://devguide.python.org">{% trans %}Python developer's guide{% endtrans %}</a><br>
+         <span class="linkdescr">{% trans %}Information on contributing to Python{% endtrans %}</span></li>
       <li class="biglink"><a class="biglink" href="https://packaging.python.org">{% trans %}Python Packaging User Guide{% endtrans %}</a><br>
          <span class="linkdescr">{% trans %}Resources relating to Python packaging{% endtrans %}</span></li>
+      <li class="biglink"><a class="biglink" href="https://www.python.org/doc/av/">{% trans %}Audio/visual talks{% endtrans %}</a><br>
+         <span class="linkdescr">{% trans %}Podcasts, talks, and video presentations from the community{% endtrans %}</span></li>
     </ul>
     <ul>
+      <li class="biglink"><a class="biglink" href="https://peps.python.org/">{% trans %}Python Enhancement Proposals{% endtrans %}</a><br>
+         <span class="linkdescr">{% trans %}Index of proposed improvements to Python{% endtrans %}</span></li>
       <li class="biglink"><a class="biglink" href="https://typing.python.org">{% trans %}Static Typing with Python{% endtrans %}</a><br>
          <span class="linkdescr">{% trans %}Information and guides about Python type safety{% endtrans %}</span></li>
     </ul>

Doc/tools/templates/indexsidebar.html

@@ -6,12 +6,3 @@ <h3>{% trans %}Docs by version{% endtrans %}</h3>
   {% include "_docs_by_version.html" without context %}
   <li><a href="https://www.python.org/doc/versions/">{% trans %}All versions{% endtrans %}</a></li>
 </ul>
-<h3>{% trans %}Other resources{% endtrans %}</h3>
-<ul>
-  {# XXX: many of these should probably be merged in the main docs #}
-  <li><a href="https://peps.python.org/">{% trans %}PEP index{% endtrans %}</a></li>
-  <li><a href="https://wiki.python.org/moin/BeginnersGuide">{% trans %}Beginner's guide{% endtrans %}</a></li>
-  <li><a href="https://wiki.python.org/moin/PythonBooks">{% trans %}Book list{% endtrans %}</a></li>
-  <li><a href="https://www.python.org/doc/av/">{% trans %}Audio/visual talks{% endtrans %}</a></li>
-  <li><a href="https://devguide.python.org/">{% trans %}Python developer’s guide{% endtrans %}</a></li>
-</ul>