backport of r51950
* regression bug, count_next was coercing a Py_ssize_t to an unsigned Py_size_t
which breaks negative counts
* added test for negative numbers
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 6898725..2baa507 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -58,6 +58,10 @@
self.assertEqual(repr(c), 'count(3)')
c.next()
self.assertEqual(repr(c), 'count(4)')
+ c = count(-9)
+ self.assertEqual(repr(c), 'count(-9)')
+ c.next()
+ self.assertEqual(c.next(), -8)
def test_cycle(self):
self.assertEqual(take(10, cycle('abc')), list('abcabcabca'))