Re-sync doc tests with the doc updates.
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 728380d..52ae110 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -471,15 +471,19 @@
>>> def all(pred, seq):
... "Returns True if pred(x) is True for every element in the iterable"
-... return not nth(ifilterfalse(pred, seq), 0)
+... return False not in imap(pred, seq)
>>> def some(pred, seq):
... "Returns True if pred(x) is True for at least one element in the iterable"
-... return bool(nth(ifilter(pred, seq), 0))
+... return True in imap(pred, seq)
>>> def no(pred, seq):
... "Returns True if pred(x) is False for every element in the iterable"
-... return not nth(ifilter(pred, seq), 0)
+... return True not in imap(pred, seq)
+
+>>> def quantify(pred, seq):
+... "Count how many times the predicate is True in the sequence"
+... return sum(imap(pred, seq))
>>> def padnone(seq):
... "Returns the sequence elements and then returns None indefinitely"