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-rw-r--r--lib/sqlalchemy/sql/expression.py6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/sqlalchemy/sql/expression.py b/lib/sqlalchemy/sql/expression.py
index 2e10b7370..2ffc5468c 100644
--- a/lib/sqlalchemy/sql/expression.py
+++ b/lib/sqlalchemy/sql/expression.py
@@ -89,9 +89,9 @@ asc = public_factory(UnaryExpression._create_asc, ".expression.asc")
desc = public_factory(UnaryExpression._create_desc, ".expression.desc")
distinct = public_factory(
UnaryExpression._create_distinct, ".expression.distinct")
-true = public_factory(True_._singleton, ".expression.true")
-false = public_factory(False_._singleton, ".expression.false")
-null = public_factory(Null._singleton, ".expression.null")
+true = public_factory(True_._instance, ".expression.true")
+false = public_factory(False_._instance, ".expression.false")
+null = public_factory(Null._instance, ".expression.null")
join = public_factory(Join._create_join, ".expression.join")
outerjoin = public_factory(Join._create_outerjoin, ".expression.outerjoin")
insert = public_factory(Insert, ".expression.insert")