Simplify doctest of tee().
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 8ab4cea..7842dd3 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -607,15 +607,11 @@
>>> dotproduct([1,2,3], [4,5,6])
32
->>> def irange(start, stop):
-... for i in range(start, stop):
-... yield i
-
->>> x, y = tee(irange(2,10))
+>>> x, y = tee(chain(xrange(2,10)))
>>> list(x), list(y)
([2, 3, 4, 5, 6, 7, 8, 9], [2, 3, 4, 5, 6, 7, 8, 9])
->>> x, y = tee(irange(2,10))
+>>> x, y = tee(chain(xrange(2,10)))
>>> zip(x, y)
[(2, 2), (3, 3), (4, 4), (5, 5), (6, 6), (7, 7), (8, 8), (9, 9)]