Skip deprecation of Sentinel class

Author: HexDecimal

src/test_typing_extensions.py

@@ -9599,8 +9599,7 @@ def test_sentinel_deprecated(self):
             class SentinelSubclass(Sentinel):
                 pass
 
-        with self.assertWarnsRegex(DeprecationWarning, r"Sentinel was renamed to typing_extensions.sentinel"):
-            my_sentinel = Sentinel(name="my_sentinel")
+        my_sentinel = Sentinel(name="my_sentinel")
         with self.assertWarnsRegex(DeprecationWarning, r"Setting attributes on sentinel is deprecated"):
             my_sentinel.foo = "bar"
 

src/typing_extensions.py

@@ -232,12 +232,7 @@ def __reduce__(self) -> str:
         """Reduce this sentinel to a singleton."""
         return self.__name__  # Module is taken from the __module__ attribute
 
-with warnings.catch_warnings():  # Allow sentinel subclass for backwards compatibility
-    warnings.simplefilter("ignore")
-
-    @deprecated("""Sentinel was renamed to typing_extensions.sentinel""")
-    class Sentinel(sentinel):
-        pass
+Sentinel = sentinel
 
 _marker = sentinel("sentinel")