Index: Lib/ast.py
===================================================================
--- Lib/ast.py	(revision 66831)
+++ Lib/ast.py	(working copy)
@@ -118,16 +118,17 @@
     parent node.  It works recursively starting at *node*.
     """
     def _fix(node, lineno, col_offset):
-        if 'lineno' in node._attributes:
-            if not hasattr(node, 'lineno'):
-                node.lineno = lineno
-            else:
-                lineno = node.lineno
-        if 'col_offset' in node._attributes:
-            if not hasattr(node, 'col_offset'):
-                node.col_offset = col_offset
-            else:
-                col_offset = node.col_offset
+        if hasattr(node, '_attributes'):
+            if 'lineno' in node._attributes:
+                if not hasattr(node, 'lineno'):
+                    node.lineno = lineno
+                else:
+                    lineno = node.lineno
+            if 'col_offset' in node._attributes:
+                if not hasattr(node, 'col_offset'):
+                    node.col_offset = col_offset
+                else:
+                    col_offset = node.col_offset
         for child in iter_child_nodes(node):
             _fix(child, lineno, col_offset)
     _fix(node, 1, 0)