More refined skip reason

Author: Daraan

src/test_typing_extensions.py

@@ -7357,12 +7357,16 @@ def test_callable_without_concatenate(self):
 
     def test_callable_with_concatenate(self):
         P = ParamSpec('P')
+        P2 = ParamSpec('P2')
         CallableP = TypeAliasType("CallableP", Callable[P, Any], type_params=(P,))
 
-        callable_concat = CallableP[Concatenate[int, P]]
-        self.assertEqual(callable_concat.__parameters__, (P,))
+        callable_concat = CallableP[Concatenate[int, P2]]
+        self.assertEqual(callable_concat.__parameters__, (P2,))
         concat_usage = callable_concat[str]
         with self.subTest("get_args of Concatenate in TypeAliasType"):
+            if not TYPING_3_9_0:
+                # args are: ([<class 'int'>, ~P2],)
+                self.skipTest("Nested ParamSpec is not substituted")
             if sys.version_info < (3, 10, 2):
                 self.skipTest("GenericAlias keeps Concatenate in __args__ prior to 3.10.2")
             self.assertEqual(get_args(concat_usage), ((int, str),))