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-rw-r--r--lib/sqlalchemy/orm/base.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/sqlalchemy/orm/base.py b/lib/sqlalchemy/orm/base.py
index 7bfafdc2b..875443e60 100644
--- a/lib/sqlalchemy/orm/base.py
+++ b/lib/sqlalchemy/orm/base.py
@@ -183,6 +183,10 @@ NOT_EXTENSION = util.symbol(
_none_set = frozenset([None, NEVER_SET, PASSIVE_NO_RESULT])
+_SET_DEFERRED_EXPIRED = util.symbol("SET_DEFERRED_EXPIRED")
+
+_DEFER_FOR_STATE = util.symbol("DEFER_FOR_STATE")
+
def _generative(*assertions):
"""Mark a method as generative, e.g. method-chained."""