Skip Montanaro's patch, SF 559833, exposing xrange type in builtins.
Also, added more regression tests to cover the new type and test its
conformity with range().
diff --git a/Lib/test/test_b2.py b/Lib/test/test_b2.py
index 459fd6b..a8bc22a 100644
--- a/Lib/test/test_b2.py
+++ b/Lib/test/test_b2.py
@@ -295,6 +295,11 @@
if tuple(xrange(5,10)) != tuple(range(5,10)): raise TestFailed, 'xrange(5,10)'
if tuple(xrange(0,10,2)) != tuple(range(0,10,2)):
raise TestFailed, 'xrange(0,10,2)'
+x = xrange(10); a = iter(x); b = iter(a) # test clearing of SF bug 564601
+if id(x) == id(a): raise TestFailed, "xrange doesn't have a separate iterator"
+if id(a) != id(b): raise TestFailed, "xrange iterator not behaving like range"
+if type(x) != xrange: raise TestFailed, "xrange type not exposed" # SF 559833
+if list(x) != list(x): raise TestFailed, "xrange should be restartable"
print 'zip'
a = (1, 2, 3)