1 files changed, 2 insertions, 27 deletions
diff --git a/lib/sqlalchemy/sql/elements.py b/lib/sqlalchemy/sql/elements.py
index 85200bf25..b26918f2f 100644
--- a/lib/sqlalchemy/sql/elements.py
+++ b/lib/sqlalchemy/sql/elements.py
@@ -4979,33 +4979,8 @@ class conv(_truncated_label):
     __slots__ = ()
 
 
-class _defer_name(_truncated_label):
-    """mark a name as 'deferred' for the purposes of automated name
-    generation.
-
-    """
-
-    __slots__ = ()
-
-    def __new__(cls, value):
-        if value is None:
-            return _NONE_NAME
-        elif isinstance(value, conv):
-            return value
-        else:
-            return super(_defer_name, cls).__new__(cls, value)
-
-    def __reduce__(self):
-        return self.__class__, (util.text_type(self),)
-
-
-class _defer_none_name(_defer_name):
-    """indicate a 'deferred' name that was ultimately the value None."""
-
-    __slots__ = ()
-
-
-_NONE_NAME = _defer_none_name("_unnamed_")
+_NONE_NAME = util.symbol("NONE_NAME")
+"""indicate a 'deferred' name that was ultimately the value None."""
 
 # for backwards compatibility in case
 # someone is re-implementing the