Deprecate sentinel repr parameter

`repr` is not in PEP 661

Author: HexDecimal

doc/index.rst

@@ -1071,17 +1071,16 @@ Capsule objects
 Sentinel objects
 ~~~~~~~~~~~~~~~~
 
-.. class:: sentinel(name, /, *, repr=None)
+.. class:: sentinel(name, /)
 
    A type used to define sentinel values. The *name* argument should be the
    name of the variable to which the return value shall be assigned.
 
-   If *repr* is provided, it will be used for the :meth:`~object.__repr__`
-   of the sentinel object. If not provided, ``"<name>"`` will be used.
-
    A sentinel is bound to the module it is created within,
    sentinels are not equal to similar named sentinels from other modules.
 
+   Assigning attributes to a sentinel including `__weakref__` is forbidden.
+
    Example::
 
       >>> from typing_extensions import sentinel, assert_type

src/test_typing_extensions.py

@@ -9550,7 +9550,7 @@ def test_sentinel_no_repr(self):
         self.assertEqual(sentinel_no_repr.__name__, 'sentinel_no_repr')
         self.assertEqual(repr(sentinel_no_repr), 'sentinel_no_repr')
 
-    def test_sentinel_explicit_repr(self):
+    def test_sentinel_deprecated_explicit_repr(self):
         sentinel_explicit_repr = sentinel('sentinel_explicit_repr', repr='explicit_repr')
 
         self.assertEqual(repr(sentinel_explicit_repr), 'explicit_repr')

src/typing_extensions.py

@@ -391,16 +391,14 @@ class sentinel:
     """Create a unique sentinel object.
 
     *name* should be the name of the variable to which the return value shall be assigned.
-
-    *repr*, if supplied, will be used for the repr of the sentinel object.
-    If not provided, "<name>" will be used.
     """
 
     @overload
-    def __init__(self, name: str, /, *, repr: typing.Optional[str] = None): ...
+    def __init__(self, name: str, /): ...
 
     @overload
-    @deprecated("'name' must be positional-only, 'repr' must be keyword-only.")
+    @deprecated("'name' must be positional-only, \
+'repr' is deprecated and must be removed.")
     def __init__(self, name: str, repr: typing.Optional[str] = None): ...
 
     def __init__(