gh-145376: Fix GC tracking in `structseq.__replace__` (#145820)

diff --git a/Lib/test/test_structseq.py b/Lib/test/test_structseq.py
index 9622151143cd78da2c154cfff952c4652de3edaf..74506fc54de50e722d085fa6d5f7ac70de426f19 100644 (file)
--- 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 @@ class StructSeqTest(unittest.TestCase):
             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 (file)
index 0000000..476be20
--- /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 b8bb041f0cff218123a33c9572c8dc23c4109022..8fa9cbba3bcce3b5b31a0da396d1f395555d7698 100644 (file)
--- 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: