Fix exec test so presence of __builtins__ doesn't break it
diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py
index 67baf09..115b5f9 100644
--- a/Lib/test/test_grammar.py
+++ b/Lib/test/test_grammar.py
@@ -283,10 +283,13 @@
f()
g = {}
exec 'z = 1' in g
+if g.has_key('__builtins__'): del g['__builtins__']
if g <> {'z': 1}: raise TestFailed, 'exec \'z = 1\' in g'
g = {}
l = {}
exec 'global a; a = 1; b = 2' in g, l
+if g.has_key('__builtins__'): del g['__builtins__']
+if l.has_key('__builtins__'): del l['__builtins__']
if (g, l) <> ({'a':1}, {'b':2}): raise TestFailed, 'exec ... in g, l'