From: Stefan Behnel <scoder@users.berlios.de>
Date: Fri, 3 Dec 2010 20:17:30 +0000 (+0100)
Subject: made fields of builtin objects immutable
X-Git-Tag: 0.14.alpha0~30
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=0e4c930b3ee136350c185eb0c02bb34ec84ea238;p=cython.git

made fields of builtin objects immutable
---

diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index f6966165..d721a69e 100755
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -3451,7 +3451,9 @@ class AttributeNode(ExprNode):
             if not target:
                 self.is_temp = 1
                 self.result_ctype = py_object_type
-    
+        elif target and self.obj.type.is_builtin_type:
+            error(self.pos, "Assignment to an immutable object field")
+
     def analyse_attribute(self, env, obj_type = None):
         # Look up attribute and set self.type and self.member.
         self.is_py_attr = 0