From e06cf4534f738f0ad4669f504fbde58bf8b3fb86 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Thu, 7 Jun 2007 13:23:24 +0000
Subject: [PATCH] Disallow function calls like foo(None=1). Backport from py3k
 rev. 55708 by Guido.

---
 Lib/test/test_compile.py | 3 +++
 Python/ast.c             | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/Lib/test/test_compile.py b/Lib/test/test_compile.py
index d1b6d8cefba..367a6945188 100644
--- a/Lib/test/test_compile.py
+++ b/Lib/test/test_compile.py
@@ -36,6 +36,9 @@ class TestSpecifics(unittest.TestCase):
     def test_syntax_error(self):
         self.assertRaises(SyntaxError, compile, "1+*3", "filename", "exec")
 
+    def test_none_keyword_arg(self):
+        self.assertRaises(SyntaxError, compile, "f(None=1)", "<string>", "exec")
+
     def test_duplicate_global_local(self):
         try:
             exec 'def f(a): global a; a = 1'
diff --git a/Python/ast.c b/Python/ast.c
index 27c3efaac87..42dcc2d8264 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -1869,6 +1869,10 @@ ast_for_call(struct compiling *c, const node *n, expr_ty func)
                     return NULL;
                 }
                 key = e->v.Name.id;
+                if (!strcmp(PyString_AS_STRING(key), "None")) {
+                    ast_error(CHILD(ch, 0), "assignment to None");
+                    return NULL;
+                }
                 e = ast_for_expr(c, CHILD(ch, 2));
                 if (!e)
                     return NULL;