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-rw-r--r--lib/sqlalchemy/orm/clsregistry.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/clsregistry.py b/lib/sqlalchemy/orm/clsregistry.py
index 037b70257..d0cb53e29 100644
--- a/lib/sqlalchemy/orm/clsregistry.py
+++ b/lib/sqlalchemy/orm/clsregistry.py
@@ -10,6 +10,9 @@ This system allows specification of classes and expressions used in
:func:`_orm.relationship` using strings.
"""
+
+from __future__ import annotations
+
import re
from typing import MutableMapping
from typing import Union