2 files changed, 13 insertions, 17 deletions
diff --git a/lib/sqlalchemy/sql/elements.py b/lib/sqlalchemy/sql/elements.py
index 444273e67..4d5bb9476 100644
--- a/lib/sqlalchemy/sql/elements.py
+++ b/lib/sqlalchemy/sql/elements.py
@@ -1617,10 +1617,10 @@ class Null(ColumnElement):
         return type_api.NULLTYPE
 
     @classmethod
-    def _singleton(cls):
+    def _instance(cls):
         """Return a constant :class:`.Null` construct."""
 
-        return NULL
+        return Null()
 
     def compare(self, other):
         return isinstance(other, Null)
@@ -1641,11 +1641,11 @@ class False_(ColumnElement):
         return type_api.BOOLEANTYPE
 
     def _negate(self):
-        return TRUE
+        return True_()
 
     @classmethod
-    def _singleton(cls):
-        """Return a constant :class:`.False_` construct.
+    def _instance(cls):
+        """Return a :class:`.False_` construct.
 
         E.g.::
 
@@ -1679,7 +1679,7 @@ class False_(ColumnElement):
 
         """
 
-        return FALSE
+        return False_()
 
     def compare(self, other):
         return isinstance(other, False_)
@@ -1700,17 +1700,17 @@ class True_(ColumnElement):
         return type_api.BOOLEANTYPE
 
     def _negate(self):
-        return FALSE
+        return False_()
 
     @classmethod
     def _ifnone(cls, other):
         if other is None:
-            return cls._singleton()
+            return cls._instance()
         else:
             return other
 
     @classmethod
-    def _singleton(cls):
+    def _instance(cls):
         """Return a constant :class:`.True_` construct.
 
         E.g.::
@@ -1745,15 +1745,11 @@ class True_(ColumnElement):
 
         """
 
-        return TRUE
+        return True_()
 
     def compare(self, other):
         return isinstance(other, True_)
 
-NULL = Null()
-FALSE = False_()
-TRUE = True_()
-
 
 class ClauseList(ClauseElement):
     """Describe a list of clauses, separated by an operator.
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")