STINNER Victor added the comment:
If you want to use --fail-env-changed with PR 2841, for example to use
test.bisect, you may want this extra patch:
diff --git a/Lib/test/_test_multiprocessing.py
b/Lib/test/_test_multiprocessing.py
index f2342c3..5f9e5c3 100644
--- a/Lib/test/_test_multiprocessing.py
+++ b/Lib/test/_test_multiprocessing.py
@@ -4352,6 +4352,7 @@ class ManagerMixin(object):
"children after %s seconds"
% (multiprocessing.active_children(), dt),
file=sys.stderr)
+ test.support.environment_altered = True
break
gc.collect() # do garbage collection
@@ -4359,6 +4360,7 @@ class ManagerMixin(object):
# This is not really an error since some tests do not
# ensure that all processes which hold a reference to a
# managed object have been joined.
+ test.support.environment_altered = True
print('Warning -- Shared objects which still exist at manager '
'shutdown:')
print(cls.manager._debug_info())
----------
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