Change module_name into a keyword-only parameter

Author: HexDecimal

doc/index.rst

@@ -1071,7 +1071,7 @@ Capsule objects
 Sentinel objects
 ~~~~~~~~~~~~~~~~
 
-.. class:: Sentinel(name, module_name=None, *, repr=None)
+.. class:: Sentinel(name, *, module_name=None, repr=None)
 
    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.

src/typing_extensions.py

@@ -174,8 +174,8 @@ class Sentinel:
     def __init__(
         self,
         name: str,
-        module_name: typing.Optional[str] = None,
         *,
+        module_name: typing.Optional[str] = None,
         repr: typing.Optional[str] = None,
     ):
         self._name = name
@@ -206,7 +206,7 @@ def __reduce__(self) -> str:
         return self._name  # Module is taken from the __module__ attribute
 
 
-_marker = Sentinel("sentinel", __name__)
+_marker = Sentinel("sentinel", module_name=__name__)
 
 # The functions below are modified copies of typing internal helpers.
 # They are needed by _ProtocolMeta and they provide support for PEP 646.