Removed code addressing #468

Author: Daraan

src/test_typing_extensions.py

@@ -7515,40 +7515,6 @@ def test_invalid_cases_before_3_11(self):
         with self.assertRaises(TypeError):
             ListOrSetT[(Generic[T], )]
 
-    def test_subscription_without_type_params(self):
-        Simple = TypeAliasType("Simple", int)
-        with self.assertRaises(TypeError, msg="Only generic type aliases are subscriptable"):
-            Simple[int]
-        with self.assertRaises(TypeError, msg="Only generic type aliases are subscriptable"):
-            Simple[[]]
-        with self.assertRaises(TypeError, msg="Only generic type aliases are subscriptable"):
-            Simple[()]
-       
-        # A TypeVar in the value does not allow subscription
-        T = TypeVar('T')
-        MissingTypeParamsErr = TypeAliasType("MissingTypeParamsErr", List[T])
-        self.assertEqual(MissingTypeParamsErr.__type_params__, ())
-        self.assertEqual(MissingTypeParamsErr.__parameters__, ())
-        with self.assertRaises(TypeError, msg="Only generic type aliases are subscriptable"):
-            MissingTypeParamsErr[int]
-        with self.assertRaises(TypeError, msg="Only generic type aliases are subscriptable"):
-            MissingTypeParamsErr[[]]
-        with self.assertRaises(TypeError, msg="Only generic type aliases are subscriptable"):
-            MissingTypeParamsErr[()]
-            
-        # However, providing type_params=() argument allows subscription
-        MissingTypeParams = TypeAliasType("MissingTypeParams", List[T], type_params=())
-        self.assertEqual(MissingTypeParams.__type_params__, ())
-        self.assertEqual(MissingTypeParams.__parameters__, ())
-        # These do not raise
-        MissingTypeParams[int]
-        MissingTypeParams[[]]
-        MissingTypeParams[()]
-        # These do not raise
-        Simple2 = TypeAliasType("Simple2", int, type_params=())
-        Simple2[int]
-        Simple2[[]]
-        Simple2[()]
 
     def test_pickle(self):
         global Alias

src/typing_extensions.py

@@ -3526,19 +3526,6 @@ def _raise_attribute_error(self, name: str) -> Never:
         def __repr__(self) -> str:
             return self.__name__
 
-        def _is_subscriptable(self):
-            if len(self.__parameters__) > 0:
-                return True
-            if _should_collect_from_parameters(self.__value__):
-                if hasattr(typing, '_collect_type_vars'):
-                    more_parameters = _collect_type_vars((self.__value__,),
-                                                         (TypeVar, ParamSpec))
-                else:
-                    more_parameters = _collect_parameters((self.__value__,))
-                if more_parameters:
-                    return True
-            return False
-
         if sys.version_info < (3, 11):
             def _check_single_param(self, param, recursion=0):
                 # Allow [], [int], [int, str], [int, ...], [int, T]
@@ -3572,8 +3559,6 @@ def _check_parameters(self, parameters):
                     ]
 
         def __getitem__(self, parameters):
-            if len(self.__parameters__) == 0 and not self._is_subscriptable():
-                raise TypeError("Only generic type aliases are subscriptable")
             if not isinstance(parameters, tuple):
                 parameters = (parameters,)
             parameters = self._check_parameters(parameters)