Disallow function calls like foo(None=1).

Backport from py3k rev. 55708 by Guido.

2 files changed, 7 insertions, 0 deletions

diff --git a/Lib/test/test_compile.py b/Lib/test/test_compile.py
index d1b6d8c..367a694 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 27c3efa..42dcc2d 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;