gh-161387: Check the type of the decimal context ContextVar by 0z5a · Pull Request #161399 · python/cpython

0z5a · 2026-11-05T09:45:46Z

_decimal.current_context() returned whatever the internal decimal_context ContextVar held, without checking PyDecContext_Check. Callers immediately cast the value to PyDecContextObject *, so setting the variable to a non-context (for example 1) segfaults on the next decimal operation.

Raise TypeError from current_context() when the stored value is not a context. CURRENT_CONTEXT already propagates NULL, so callers fail cleanly.

Tests: new CContextAPItests.test_current_context_var_wrong_type. Built current main (5aa2f705) with the C _decimal extension (libmpdec 2.5.1): the reproducer exits with SIGSEGV (rc=139) before the change and raises TypeError after. The new test and the full test_decimal suite (751 tests, 9 skipped) pass.

0z5a · 2026-11-05T11:20:53Z

Addressed in c10e2e7: the error now reports the received type (expected a Context instance, got int), and the test now finds the matching context vars, saves reset tokens, restores them via a helper, and only then asserts the TypeError.

sobolevn

Please, assert that after the exception is handled: context var must not be cleared. Its value must not change

Co-authored-by: sobolevn <mail@sobolevn.me>

miss-islington-app · 2026-11-06T07:55:31Z

Thanks @0z5a for the PR, and @sobolevn for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14, 3.15.
🐍🍒⛏🤖

bedevere-app · 2026-11-06T07:55:48Z

GH-161465 is a backport of this pull request to the 3.15 branch.

bedevere-app · 2026-11-06T07:55:53Z

GH-161466 is a backport of this pull request to the 3.14 branch.

bedevere-bot · 2026-11-06T08:21:13Z

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot iOS ARM64 Simulator 3.x (tier-3) has failed when building commit 4b50f88.

What do you need to do:

Don't panic.
Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1380/builds/8328) and take a look at the build logs.
Check if the failure is related to this commit (4b50f88) or if it is a false positive.
If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1380/builds/8328

Summary of the results of the build (if available):

Click to see traceback logs

remote: Enumerating objects: 24, done.        
remote: Counting objects:   4% (1/24)        
remote: Counting objects:   8% (2/24)        
remote: Counting objects:  12% (3/24)        
remote: Counting objects:  16% (4/24)        
remote: Counting objects:  20% (5/24)        
remote: Counting objects:  25% (6/24)        
remote: Counting objects:  29% (7/24)        
remote: Counting objects:  33% (8/24)        
remote: Counting objects:  37% (9/24)        
remote: Counting objects:  41% (10/24)        
remote: Counting objects:  45% (11/24)        
remote: Counting objects:  50% (12/24)        
remote: Counting objects:  54% (13/24)        
remote: Counting objects:  58% (14/24)        
remote: Counting objects:  62% (15/24)        
remote: Counting objects:  66% (16/24)        
remote: Counting objects:  70% (17/24)        
remote: Counting objects:  75% (18/24)        
remote: Counting objects:  79% (19/24)        
remote: Counting objects:  83% (20/24)        
remote: Counting objects:  87% (21/24)        
remote: Counting objects:  91% (22/24)        
remote: Counting objects:  95% (23/24)        
remote: Counting objects: 100% (24/24)        
remote: Counting objects: 100% (24/24), done.        
remote: Compressing objects:   7% (1/13)        
remote: Compressing objects:  15% (2/13)        
remote: Compressing objects:  23% (3/13)        
remote: Compressing objects:  30% (4/13)        
remote: Compressing objects:  38% (5/13)        
remote: Compressing objects:  46% (6/13)        
remote: Compressing objects:  53% (7/13)        
remote: Compressing objects:  61% (8/13)        
remote: Compressing objects:  69% (9/13)        
remote: Compressing objects:  76% (10/13)        
remote: Compressing objects:  84% (11/13)        
remote: Compressing objects:  92% (12/13)        
remote: Compressing objects: 100% (13/13)        
remote: Compressing objects: 100% (13/13), done.        
remote: Total 13 (delta 11), reused 1 (delta 0), pack-reused 0 (from 0)        
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD
Note: switching to '4b50f88ba146d71f03f917215d95a320708151e9'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 4b50f88ba14 gh-161387: Check the type of the decimal context `ContextVar` (#161399)
Switched to and reset branch 'main'

configure: WARNING: no system libmpdec found; falling back to pure-Python version for the decimal module
configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:282:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  282 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:289:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  289 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:435:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  435 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:442:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  442 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:548:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  548 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:557:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  557 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:579:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  579 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:590:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  590 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:687:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  687 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:732:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  732 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:758:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  758 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:769:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  769 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:782:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  782 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:927:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  927 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:940:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  940 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:957:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  957 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:964:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  964 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:1199:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1199 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:1219:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1219 |           CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
19 warnings generated.

configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:282:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  282 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:289:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  289 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:435:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  435 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:442:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  442 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:548:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  548 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:557:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  557 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:579:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  579 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:590:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  590 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:687:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  687 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:732:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  732 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:758:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  758 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:769:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  769 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:782:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  782 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:927:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  927 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:940:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  940 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:957:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  957 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:964:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  964 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:1199:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1199 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:1219:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1219 |           CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
19 warnings generated.
ld: warning: ignoring duplicate libraries: '-lm'
ld: warning: ignoring duplicate libraries: '-lm'
configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:282:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  282 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:289:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  289 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:435:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  435 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:442:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  442 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:548:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  548 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:557:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  557 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:579:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  579 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:590:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  590 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:687:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  687 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:732:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  732 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:758:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  758 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:769:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  769 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:782:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  782 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:927:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  927 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:940:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  940 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:957:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  957 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:964:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  964 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:1199:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1199 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:1219:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1219 |           CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
19 warnings generated.
ld: warning: ignoring duplicate libraries: '-lm'
ld: warning: ignoring duplicate libraries: '-lm'
configure: WARNING: x86_64-apple-ios-simulator/clang is not supported
configure: WARNING: pkg-config is missing. Some dependencies may not be detected correctly.
configure: WARNING:

Platform "x86_64-apple-ios-simulator" with compiler "clang" is not supported by the
CPython core team, see https://peps.python.org/pep-0011/ for more information.

In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:282:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  282 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:289:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  289 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:435:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  435 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:442:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  442 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:548:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  548 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:557:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  557 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:579:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  579 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:590:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  590 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:687:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  687 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:732:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  732 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:758:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  758 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:769:9: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  769 |         CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |         ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:782:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  782 |           CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:927:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  927 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:940:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  940 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:957:5: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  957 |     CHECK_NMSTRT_CASES(enc, ptr, end, nextTokPtr)
      |     ^
../../Modules/expat/xmltok_impl.c:115:5: note: expanded from macro 'CHECK_NMSTRT_CASES'
  115 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:964:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
  964 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:1199:7: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1199 |       CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |       ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
In file included from ../../Modules/expat/xmltok.c:250:
../../Modules/expat/xmltok_impl.c:1219:11: warning: fallthrough annotation in unreachable code [-Wunreachable-code-fallthrough]
 1219 |           CHECK_NAME_CASES(enc, ptr, end, nextTokPtr)
      |           ^
../../Modules/expat/xmltok_impl.c:86:5: note: expanded from macro 'CHECK_NAME_CASES'
   86 |     EXPAT_FALLTHROUGH;                                                         \
      |     ^
../../Modules/expat/fallthrough.h:47:33: note: expanded from macro 'EXPAT_FALLTHROUGH'
   47 | #      define EXPAT_FALLTHROUGH __attribute__((fallthrough))
      |                                 ^
19 warnings generated.
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(brc.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(dynamic_annotations.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(gc_free_threading.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(index_pool.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(jit.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(jit_publish.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(optimizer_analysis.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(optimizer_symbols.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(pystats.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(stackrefs.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(uniqueid.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(perf_jit_trampoline.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libpython3.16.a(jit_unwind.o) has no symbols
ld: warning: ignoring duplicate libraries: '-lm'
ld: warning: ignoring duplicate libraries: '-lm'

--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:iOS Simulator, id:4F9AFDE7-A49A-46AD-B161-FCA22E48EA55, OS:18.3.1, name:iPhone SE (3rd generation) }
{ platform:iOS Simulator, id:4F9AFDE7-A49A-46AD-B161-FCA22E48EA55, OS:18.3.1, name:iPhone SE (3rd generation) }

…H-161399) (#161465) gh-161387: Check the type of the decimal context `ContextVar` (GH-161399) (cherry picked from commit 4b50f88) Co-authored-by: 0z5a <dinadegttyarenko6@gmail.com> Co-authored-by: sobolevn <mail@sobolevn.me>

…H-161399) (#161466) gh-161387: Check the type of the decimal context `ContextVar` (GH-161399) (cherry picked from commit 4b50f88) Co-authored-by: 0z5a <dinadegttyarenko6@gmail.com> Co-authored-by: sobolevn <mail@sobolevn.me>

pythongh-161387: Check the type of the decimal context ContextVar

cd34ce8

bedevere-app Bot added the awaiting review label Nov 5, 2026

bedevere-app Bot mentioned this pull request Nov 5, 2026

decimal: _decimal casts the value of its decimal_context ContextVar without a type check #161387

Closed

Fix test isolation for the duplicate decimal_context var

0254fa8

sobolevn reviewed Nov 5, 2026

View reviewed changes

Comment thread Modules/_decimal/_decimal.c Resolved

Comment thread Lib/test/test_decimal.py Resolved

Comment thread Lib/test/test_decimal.py Resolved

Address review: report the received type, tidy the test

c10e2e7

sobolevn reviewed Nov 5, 2026

View reviewed changes

Comment thread Lib/test/test_decimal.py Resolved

Skip the test when _decimal has no context variables

18682f0

sobolevn reviewed Nov 5, 2026

View reviewed changes

Comment thread Modules/_decimal/_decimal.c Resolved

Comment thread Modules/_decimal/_decimal.c Resolved

Comment thread Lib/test/test_decimal.py Resolved

0z5a and others added 3 commits November 5, 2026 12:37

Update Modules/_decimal/_decimal.c

6c4cfcb

Co-authored-by: sobolevn <mail@sobolevn.me>

Update Lib/test/test_decimal.py

360d166

Co-authored-by: sobolevn <mail@sobolevn.me>

Test that the wrong-typed context is not leaked

589b9f2

sobolevn reviewed Nov 5, 2026

View reviewed changes

Comment thread Lib/test/test_decimal.py Resolved

Assert the context var is unchanged and check the error message

7bbee0d

sobolevn approved these changes Nov 5, 2026

View reviewed changes

bedevere-app Bot added awaiting merge and removed awaiting review labels Nov 5, 2026

sobolevn requested a review from skirpichev November 5, 2026 13:11

skirpichev approved these changes Nov 5, 2026

View reviewed changes

skirpichev added needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Nov 5, 2026

sobolevn merged commit 4b50f88 into python:main Nov 6, 2026
64 checks passed

bedevere-app Bot removed the awaiting merge label Nov 6, 2026

bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Nov 6, 2026

bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Nov 6, 2026

Navigation Menu

Repository navigation

gh-161387: Check the type of the decimal context ContextVar - #161399

gh-161387: Check the type of the decimal context ContextVar#161399
sobolevn merged 8 commits into
python:mainfrom
0z5a:fix-decimal-contextvar-type

0z5a commented Nov 5, 2026 •

edited by sobolevn

Loading

Uh oh!

Uh oh!

Uh oh!

Uh oh!

0z5a commented Nov 5, 2026

Uh oh!

Uh oh!

sobolevn left a comment

Uh oh!

Uh oh!

Uh oh!

Uh oh!

Uh oh!

Uh oh!

miss-islington-app Bot commented Nov 6, 2026

Uh oh!

bedevere-app Bot commented Nov 6, 2026

Uh oh!

bedevere-app Bot commented Nov 6, 2026

Uh oh!

bedevere-bot commented Nov 6, 2026

Uh oh!

Reviewers

Uh oh!

Assignees

Labels

Projects

Milestone

Development

Uh oh!

4 participants

Conversation

0z5a commented Nov 5, 2026 • edited by sobolevn Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

Uh oh!

Uh oh!

Uh oh!

0z5a commented Nov 5, 2026

Uh oh!

Uh oh!

sobolevn left a comment

Choose a reason for hiding this comment

Uh oh!

Uh oh!

Uh oh!

Uh oh!

Uh oh!

Uh oh!

miss-islington-app Bot commented Nov 6, 2026

Uh oh!

bedevere-app Bot commented Nov 6, 2026

Uh oh!

bedevere-app Bot commented Nov 6, 2026

Uh oh!

bedevere-bot commented Nov 6, 2026

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Uh oh!

Reviewers

Uh oh!

Assignees

Labels

Projects

Milestone

Development

Uh oh!

4 participants

0z5a commented Nov 5, 2026 •

edited by sobolevn

Loading