From 58e5be5f6e42367641f79727d2f24ccab520abe8 Mon Sep 17 00:00:00 2001
From: Robert Bradshaw <robertwb@math.washington.edu>
Date: Thu, 21 Jan 2010 16:23:13 -0800
Subject: [PATCH] Warning for implicitly declared variables.

---
 Cython/Compiler/ExprNodes.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index 6679002a..625d16af 100644
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -1157,6 +1157,8 @@ class NameNode(AtomicExprNode):
         if not self.entry:
             self.entry = env.lookup_here(self.name)
         if not self.entry:
+            if env.directives['warn.undeclared']:
+                warning(self.pos, "implicit declaration of '%s'" % self.name, 1)
             if env.directives['infer_types'] != False:
                 type = unspecified_type
             else:
-- 
2.26.2