gh-104555: Fix isinstance() and issubclass() for runtime-checkable protocols that use PEP 695 (#104556)

Fixes #104555

2 files changed, 19 insertions, 1 deletions

diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 71aff87dca..0cd67c51e5 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -3134,6 +3134,24 @@ class ProtocolTests(BaseTestCase):
 
         self.assertIsInstance(Test(), PSub)
 
+    def test_pep695_generic_protocol_callable_members(self):
+        @runtime_checkable
+        class Foo[T](Protocol):
+            def meth(self, x: T) -> None: ...
+
+        class Bar[T]:
+            def meth(self, x: T) -> None: ...
+
+        self.assertIsInstance(Bar(), Foo)
+        self.assertIsSubclass(Bar, Foo)
+
+        @runtime_checkable
+        class SupportsTrunc[T](Protocol):
+            def __trunc__(self) -> T: ...
+
+        self.assertIsInstance(0.0, SupportsTrunc)
+        self.assertIsSubclass(float, SupportsTrunc)
+
     def test_init_called(self):
         T = TypeVar('T')
 
diff --git a/Lib/typing.py b/Lib/typing.py
index 8d132e2cbf..50a8f51594 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -1663,7 +1663,7 @@ class _TypingEllipsis:
 _TYPING_INTERNALS = frozenset({
     '__parameters__', '__orig_bases__',  '__orig_class__',
     '_is_protocol', '_is_runtime_protocol', '__protocol_attrs__',
-    '__callable_proto_members_only__',
+    '__callable_proto_members_only__', '__type_params__',
 })
 
 _SPECIAL_NAMES = frozenset({