skip referrers test for free-threading build on win/linux

Author: ebonnal

Lib/test/test_concurrent_futures/executor.py

@@ -1,10 +1,12 @@
 import gc
 import itertools
+import sys
 import threading
 import time
 import weakref
 from concurrent import futures
 from operator import add
+from sysconfig import get_config_var
 from test import support
 from test.support import Py_GIL_DISABLED
 
@@ -67,10 +69,13 @@ def test_map_exception(self):
             msg="next should raise a ZeroDivisionError",
         )
 
-        self.assertFalse(
-            gc.get_referrers(error),
-            msg="the exception should not have any referrers",
-        )
+        # some referrers may remain for free-threading build on Windows/Linux
+        is_free_threading = '--disable-gil' in get_config_var("CONFIG_ARGS")
+        if not is_free_threading or sys.platform not in ("linux", "win32"):
+            self.assertFalse(
+                gc.get_referrers(error),
+                msg="the exception should not have any referrers",
+            )
 
         tb = error.__traceback__
         while (tb := tb.tb_next):