Method nested

Lib/test/test_coroutines.py:2390–2391

()

            self.assertEqual(sys.get_coroutine_origin_tracking_depth(), 2)

            def nested():
                return (self.here(), corofn())
            fname, lineno = self.here()
            ((nested_fname, nested_lineno), coro) = nested()
            with contextlib.closing(coro):