Remove backwards incompatable change to string identifiers.

diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index 1d93fdb1c600092e749c3164f001419122e6ece5..4c11d6664f68ad9c34ab13b9a019075bbb203378 100644 (file)
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -914,7 +914,7 @@ class StringNode(PyConstNode):
     # is_identifier  boolean
 
     type = str_type
-    is_identifier = False
+    is_identifier = None
 
     def coerce_to(self, dst_type, env):
         if dst_type is not py_object_type and dst_type is not str_type: