Merged revisions 86538 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r86538 | benjamin.peterson | 2010-11-19 19:38:49 -0600 (Fri, 19 Nov 2010) | 1 line

  use %R format code; fixes invalid dereferencing #10391
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1 files changed, 10 insertions, 0 deletions

diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 7ee16bf5bd..01c4ba38ca 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -183,6 +183,16 @@ class AST_Tests(unittest.TestCase):
                     ast2 = mod.loads(mod.dumps(ast, protocol))
                     self.assertEquals(to_tuple(ast2), to_tuple(ast))
 
+    def test_invalid_sum(self):
+        pos = dict(lineno=2, col_offset=3)
+        m = ast.Module([ast.Expr(ast.expr(**pos), **pos)])
+        try:
+            compile(m, "<test>", "exec")
+        except TypeError as exc:
+            self.assertIn("but got <_ast.expr", str(exc))
+        else:
+            self.fail("needed TypeError")
+
 
 class ASTHelpers_Test(unittest.TestCase):