Merged revisions 67171 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r67171 | benjamin.peterson | 2008-11-08 12:38:54 -0600 (Sat, 08 Nov 2008) | 4 lines

  check for assignment to __debug__ during AST generation

  Also, give assignment to None a better error message
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diff --git a/Python/ast.c b/Python/ast.c
index 60906a1..1cf100e 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -354,6 +354,7 @@
     "None",
     "True",
     "False",
+    "__debug__",
     NULL,
 };