Sync pre-release CPython 3.15 branch from GitHub (2026-06-12)

Summary:
Imported python/cpython `3.15.0b2+dev` from upstream rev [`a2e5516`](https://www.github.com/python/cpython/commit/a2e551610f6248cfd130172e1cf9f5ee811758b9) (committed 2026-06-12 01:47:01+00:00).

# Commit Info

- Base: (`3.15.0b2+dev`) - [`73e5d44`](https://www.github.com/python/cpython/commit/73e5d444ac4f0801074c3a27271070774ff88b62) (commit date: 2026-06-09 23:33:04+00:00)
- Imported: (`3.15.0b2+dev`) - [`a2e5516`](https://www.github.com/python/cpython/commit/a2e551610f6248cfd130172e1cf9f5ee811758b9) (commit date: 2026-06-12 01:47:01+00:00)

# Noteworthy file changes

- Low-signal files (13 added) (NEWS.d, docs, .github)

Complete list of added/removed files: https://www.internalfb.com/intern/everpaste/?color=0&handle=GAyXqSgfXq6Rfh4GALgNiRj8aeEFbr0LAAAz

Reviewed By: yoney

Differential Revision: D108380163

fbshipit-source-id: b78b9890a2e83f4602f16262dc6f578841ef6660

Author: ambv

.github/workflows/reusable-san.yml

@@ -82,19 +82,19 @@ jobs:
       run: make -j4
     - name: Display build info
       run: make pythoninfo
-    # test_{capi,faulthandler} are skipped under UBSan because
+    # test_capi is skipped under UBSan because
     # they raise signals that UBSan with halt_on_error=1 intercepts.
     - name: Tests
       run: >-
         ./python -m test
         ${{ inputs.sanitizer == 'TSan' && '--tsan' || '' }}
-        ${{ inputs.sanitizer == 'UBSan' && '-x test_capi -x test_faulthandler' || '' }}
-        -j4
+        ${{ inputs.sanitizer == 'UBSan' && '-x test_capi' || '' }}
+        -j4 -W
     - name: Parallel tests
       if: >-
         inputs.sanitizer == 'TSan'
         && fromJSON(inputs.free-threading)
-      run: ./python -m test --tsan-parallel --parallel-threads=4 -j4
+      run: ./python -m test --tsan-parallel --parallel-threads=4 -j4 -W
     - name: Display logs
       if: always()
       run: find "${GITHUB_WORKSPACE}" -name 'san_log.*' | xargs head -n 1000

Doc/Makefile

@@ -88,9 +88,9 @@ htmlhelp: build
 	      "build/htmlhelp/pydoc.hhp project file."
 
 .PHONY: latex
-latex: _ensure-sphinxcontrib-svg2pdfconverter
 latex: BUILDER = latex
-latex: build
+latex: _ensure-sphinxcontrib-svg2pdfconverter
+	$(MAKE) build BUILDER=$(BUILDER)
 	@echo "Build finished; the LaTeX files are in build/latex."
 	@echo "Run \`make all-pdf' or \`make all-ps' in that directory to" \
 	      "run these through (pdf)latex."

Doc/c-api/memory.rst

@@ -77,7 +77,7 @@ memory footprint as a whole. Consequently, under certain circumstances, the
 Python memory manager may or may not trigger appropriate actions, like garbage
 collection, memory compaction or other preventive procedures. Note that by using
 the C library allocator as shown in the previous example, the allocated memory
-for the I/O buffer escapes completely the Python memory manager.
+for the I/O buffer completely escapes the Python memory manager.
 
 .. seealso::
 
@@ -157,7 +157,7 @@ zero bytes.
 
 .. c:function:: void* PyMem_RawCalloc(size_t nelem, size_t elsize)
 
-   Allocates *nelem* elements each whose size in bytes is *elsize* and returns
+   Allocates *nelem* elements each of size *elsize* bytes and returns
    a pointer of type :c:expr:`void*` to the allocated memory, or ``NULL`` if the
    request fails. The memory is initialized to zeros.
 
@@ -235,7 +235,7 @@ In the GIL-enabled build (default build) the
 
 .. c:function:: void* PyMem_Calloc(size_t nelem, size_t elsize)
 
-   Allocates *nelem* elements each whose size in bytes is *elsize* and returns
+   Allocates *nelem* elements each of size *elsize* bytes and returns
    a pointer of type :c:expr:`void*` to the allocated memory, or ``NULL`` if the
    request fails. The memory is initialized to zeros.
 
@@ -368,7 +368,7 @@ The :ref:`default object allocator <default-memory-allocators>` uses the
 
 .. c:function:: void* PyObject_Calloc(size_t nelem, size_t elsize)
 
-   Allocates *nelem* elements each whose size in bytes is *elsize* and returns
+   Allocates *nelem* elements each of size *elsize* bytes and returns
    a pointer of type :c:expr:`void*` to the allocated memory, or ``NULL`` if the
    request fails. The memory is initialized to zeros.
 

Doc/c-api/weakref.rst

@@ -42,8 +42,8 @@ as much as it can.
    callable object that receives notification when *ob* is garbage collected; it
    should accept a single parameter, which will be the weak reference object
    itself. *callback* may also be ``None`` or ``NULL``.  If *ob* is not a
-   weakly referenceable object, or if *callback* is not callable, ``None``, or
-   ``NULL``, this will return ``NULL`` and raise :exc:`TypeError`.
+   weakly referenceable object, this will raise :exc:`TypeError` and return
+   ``NULL``.
 
    .. seealso::
       :c:func:`PyType_SUPPORTS_WEAKREFS` for checking if *ob* is weakly
@@ -58,8 +58,8 @@ as much as it can.
    be a callable object that receives notification when *ob* is garbage
    collected; it should accept a single parameter, which will be the weak
    reference object itself. *callback* may also be ``None`` or ``NULL``.  If *ob*
-   is not a weakly referenceable object, or if *callback* is not callable,
-   ``None``, or ``NULL``, this will return ``NULL`` and raise :exc:`TypeError`.
+   weakly referenceable object, this will raise :exc:`TypeError` and return
+   ``NULL``.
 
    .. seealso::
       :c:func:`PyType_SUPPORTS_WEAKREFS` for checking if *ob* is weakly

Doc/howto/annotations.rst

@@ -4,8 +4,6 @@
 Annotations Best Practices
 **************************
 
-:author: Larry Hastings
-
 .. topic:: Abstract
 
   This document is designed to encapsulate the best practices

Doc/howto/argparse.rst

@@ -4,8 +4,6 @@
 Argparse Tutorial
 *****************
 
-:author: Tshepang Mbambo
-
 .. currentmodule:: argparse
 
 This tutorial is intended to be a gentle introduction to :mod:`argparse`, the

Doc/howto/curses.rst

@@ -6,9 +6,6 @@
 
 .. currentmodule:: curses
 
-:Author: A.M. Kuchling, Eric S. Raymond
-:Release: 2.04
-
 
 .. topic:: Abstract
 

Doc/howto/descriptor.rst

@@ -4,9 +4,6 @@
 Descriptor Guide
 ================
 
-:Author: Raymond Hettinger
-:Contact: <python at rcn dot com>
-
 .. Contents::
 
 

Doc/howto/functional.rst

@@ -4,9 +4,6 @@
   Functional Programming HOWTO
 ********************************
 
-:Author: \A. M. Kuchling
-:Release: 0.32
-
 In this document, we'll take a tour of Python's features suitable for
 implementing programs in a functional style.  After an introduction to the
 concepts of functional programming, we'll look at language features such as
@@ -1185,7 +1182,8 @@ about whether this lambda-free style is better.
 Revision History and Acknowledgements
 =====================================
 
-The author would like to thank the following people for offering suggestions,
+This HOWTO was originally written by A. M. Kuchling. The author would like to
+thank the following people for offering suggestions,
 corrections and assistance with various drafts of this article: Ian Bicking,
 Nick Coghlan, Nick Efford, Raymond Hettinger, Jim Jewett, Mike Krell, Leandro
 Lameiro, Jussi Salmela, Collin Winter, Blake Winton.
@@ -1239,9 +1237,9 @@ Text Processing".
 
 Mertz also wrote a 3-part series of articles on functional programming
 for IBM's DeveloperWorks site; see
-`part 1 <https://developer.ibm.com/articles/l-prog/>`__,
-`part 2 <https://developer.ibm.com/tutorials/l-prog2/>`__, and
-`part 3 <https://developer.ibm.com/tutorials/l-prog3/>`__,
+`part 1 <https://web.archive.org/web/20211006103639/https://developer.ibm.com/articles/l-prog/>`__,
+`part 2 <https://web.archive.org/web/20211205224606/https://developer.ibm.com/tutorials/l-prog2/>`__, and
+`part 3 <https://web.archive.org/web/20211127083846/https://developer.ibm.com/tutorials/l-prog3/>`__.
 
 
 Python documentation

Doc/howto/instrumentation.rst

@@ -6,9 +6,6 @@
 Instrumenting CPython with DTrace and SystemTap
 ===============================================
 
-:author: David Malcolm
-:author: Łukasz Langa
-
 DTrace and SystemTap are monitoring tools, each providing a way to inspect
 what the processes on a computer system are doing.  They both use
 domain-specific languages allowing a user to write scripts which: