bpo-28556: Add a regression test to typing (GH-15396)
This adds a regression test for the issue found in the Python 2 backport, see https://github.com/python/typing/issues/656
https://bugs.python.org/issue28556
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index ba001c3..ba0800f 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -961,6 +961,23 @@
self.assertIsInstance(C(1), P)
self.assertIsInstance(C(1), PG)
+ def test_protocol_checks_after_subscript(self):
+ class P(Protocol[T]): pass
+ class C(P[T]): pass
+ class Other1: pass
+ class Other2: pass
+ CA = C[Any]
+
+ self.assertNotIsInstance(Other1(), C)
+ self.assertNotIsSubclass(Other2, C)
+
+ class D1(C[Any]): pass
+ class D2(C[Any]): pass
+ CI = C[int]
+
+ self.assertIsInstance(D1(), C)
+ self.assertIsSubclass(D2, C)
+
def test_protocols_support_register(self):
@runtime_checkable
class P(Protocol):