From cccd9dd3e476209f698344c93bdddfef3ca9af23 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Mon, 16 Mar 2026 10:08:15 +0100
Subject: [PATCH] [3.14] gh-145376: Fix GC tracking in `structseq.__replace__`
 (GH-145820) (#145922)

gh-145376: Fix GC tracking in `structseq.__replace__` (GH-145820)
(cherry picked from commit 00a25859a94b6bf34e58a5176e2befab7e273d20)

Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>
---
 Lib/test/test_structseq.py                               | 9 +++++++++
 .../2026-03-11-21-27-28.gh-issue-145376.LfDvyw.rst       | 1 +
 Objects/structseq.c                                      | 1 +
 3 files changed, 11 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Core_and_Builtins/2026-03-11-21-27-28.gh-issue-145376.LfDvyw.rst

diff --git a/Lib/test/test_structseq.py b/Lib/test/test_structseq.py
index 9622151143c..74506fc54de 100644
--- a/Lib/test/test_structseq.py
+++ b/Lib/test/test_structseq.py
@@ -1,4 +1,5 @@
 import copy
+import gc
 import os
 import pickle
 import re
@@ -355,6 +356,14 @@ def test_reference_cycle(self):
             type(t).refcyle = t
         """))
 
+    def test_replace_gc_tracked(self):
+        # Verify that __replace__ results are properly GC-tracked
+        time_struct = time.gmtime(0)
+        lst = []
+        replaced_struct = time_struct.__replace__(tm_year=lst)
+        lst.append(replaced_struct)
+
+        self.assertTrue(gc.is_tracked(replaced_struct))
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-03-11-21-27-28.gh-issue-145376.LfDvyw.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-03-11-21-27-28.gh-issue-145376.LfDvyw.rst
new file mode 100644
index 00000000000..476be205da8
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2026-03-11-21-27-28.gh-issue-145376.LfDvyw.rst
@@ -0,0 +1 @@
+Fix GC tracking in ``structseq.__replace__()``.
diff --git a/Objects/structseq.c b/Objects/structseq.c
index c05bcde24c4..2dc59b0ff64 100644
--- a/Objects/structseq.c
+++ b/Objects/structseq.c
@@ -445,6 +445,7 @@ structseq_replace(PyObject *op, PyObject *args, PyObject *kwargs)
         }
     }
 
+    _PyObject_GC_TRACK(result);
     return (PyObject *)result;
 
 error: