Method test_instantiate_immutable

Lib/test/test_typing.py:9728–9737

(self)

        self.assertEqual(MyCount[int]([4, 4, 5]), {4: 2, 5: 1})

    def test_instantiate_immutable(self):
        class C:
            def __setattr__(self, key, value):
                raise Exception("should be ignored")

        A = Annotated[C, "a decoration"]
        # gh-115165: This used to cause RuntimeError to be raised
        # when we tried to set `__orig_class__` on the `C` instance
        # returned by the `A()` call
        self.assertIsInstance(A(), C)

    def test_cannot_instantiate_forward(self):
        A = Annotated["int", (5, 6)]