Issue #1766304: The range.__contains__ optimization should only be
applied to ints, not to instances of subclasses of int.
diff --git a/Lib/test/test_range.py b/Lib/test/test_range.py
index 1a40dd1..638d943 100644
--- a/Lib/test/test_range.py
+++ b/Lib/test/test_range.py
@@ -97,6 +97,12 @@
# ..except if explicitly told so.
self.assertTrue(int(C2()) in range(3))
+ # Check that the range.__contains__ optimization is only
+ # used for ints, not for instances of subclasses of int.
+ class C3(int):
+ def __eq__(self, other): return True
+ self.assertTrue(C3(11) in range(10))
+ self.assertTrue(C3(11) in list(range(10)))
def test_strided_limits(self):
r = range(0, 101, 2)