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-rw-r--r--lib/sqlalchemy/util/__init__.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/sqlalchemy/util/__init__.py b/lib/sqlalchemy/util/__init__.py
index d443cf031..6f409c9e2 100644
--- a/lib/sqlalchemy/util/__init__.py
+++ b/lib/sqlalchemy/util/__init__.py
@@ -26,6 +26,7 @@ from ._collections import IdentitySet as IdentitySet
from ._collections import immutabledict as immutabledict
from ._collections import LRUCache as LRUCache
from ._collections import merge_lists_w_ordering as merge_lists_w_ordering
+from ._collections import NONE_SET as NONE_SET
from ._collections import ordered_column_set as ordered_column_set
from ._collections import OrderedDict as OrderedDict
from ._collections import OrderedIdentitySet as OrderedIdentitySet