test_sf_950057's gen1() used an assert statement, which caused the test
to fail when running with -O.  Changed to raise AssertionError instead.
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 54e46e1..e4c29ad 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -652,7 +652,7 @@
             hist.append(0)
             yield 1
             hist.append(1)
-            assert False
+            raise AssertionError
             hist.append(2)
 
         def gen2(x):