Use PEP 570 syntax in stdlib (#11250)

stdlib/typing_extensions.pyi

@@ -235,22 +235,22 @@ class _TypedDict(Mapping[str, object], metaclass=abc.ABCMeta):
     def setdefault(self, k: Never, default: object) -> object: ...
     # Mypy plugin hook for 'pop' expects that 'default' has a type variable type.
     def pop(self, k: Never, default: _T = ...) -> object: ...  # pyright: ignore[reportInvalidTypeVarUse]
-    def update(self: _T, __m: _T) -> None: ...
+    def update(self: _T, m: _T, /) -> None: ...
     def items(self) -> dict_items[str, object]: ...
     def keys(self) -> dict_keys[str, object]: ...
     def values(self) -> dict_values[str, object]: ...
     def __delitem__(self, k: Never) -> None: ...
     if sys.version_info >= (3, 9):
         @overload
-        def __or__(self, __value: Self) -> Self: ...
+        def __or__(self, value: Self, /) -> Self: ...
         @overload
-        def __or__(self, __value: dict[str, Any]) -> dict[str, object]: ...
+        def __or__(self, value: dict[str, Any], /) -> dict[str, object]: ...
         @overload
-        def __ror__(self, __value: Self) -> Self: ...
+        def __ror__(self, value: Self, /) -> Self: ...
         @overload
-        def __ror__(self, __value: dict[str, Any]) -> dict[str, object]: ...
+        def __ror__(self, value: dict[str, Any], /) -> dict[str, object]: ...
         # supposedly incompatible definitions of `__ior__` and `__or__`:
-        def __ior__(self, __value: Self) -> Self: ...  # type: ignore[misc]
+        def __ior__(self, value: Self, /) -> Self: ...  # type: ignore[misc]
 
 # TypedDict is a (non-subscriptable) special form.
 TypedDict: object
@@ -335,9 +335,9 @@ if sys.version_info >= (3, 11):
 else:
     Self: _SpecialForm
     Never: _SpecialForm
-    def reveal_type(__obj: _T) -> _T: ...
-    def assert_never(__arg: Never) -> Never: ...
-    def assert_type(__val: _T, __typ: Any) -> _T: ...
+    def reveal_type(obj: _T, /) -> _T: ...
+    def assert_never(arg: Never, /) -> Never: ...
+    def assert_type(val: _T, typ: Any, /) -> _T: ...
     def clear_overloads() -> None: ...
     def get_overloads(func: Callable[..., object]) -> Sequence[Callable[..., object]]: ...
 
@@ -373,7 +373,7 @@ else:
 
     class NewType:
         def __init__(self, name: str, tp: Any) -> None: ...
-        def __call__(self, __obj: _T) -> _T: ...
+        def __call__(self, obj: _T, /) -> _T: ...
         __supertype__: type
         if sys.version_info >= (3, 10):
             def __or__(self, other: Any) -> _SpecialForm: ...
@@ -456,16 +456,16 @@ class deprecated:
     message: str
     category: type[Warning] | None
     stacklevel: int
-    def __init__(self, __message: str, *, category: type[Warning] | None = ..., stacklevel: int = 1) -> None: ...
-    def __call__(self, __arg: _T) -> _T: ...
+    def __init__(self, message: str, /, *, category: type[Warning] | None = ..., stacklevel: int = 1) -> None: ...
+    def __call__(self, arg: _T, /) -> _T: ...
 
 if sys.version_info >= (3, 12):
     from collections.abc import Buffer as Buffer
     from types import get_original_bases as get_original_bases
     from typing import TypeAliasType as TypeAliasType, override as override
 else:
-    def override(__arg: _F) -> _F: ...
-    def get_original_bases(__cls: type) -> tuple[Any, ...]: ...
+    def override(arg: _F, /) -> _F: ...
+    def get_original_bases(cls: type, /) -> tuple[Any, ...]: ...
     @final
     class TypeAliasType:
         def __init__(
@@ -491,17 +491,17 @@ else:
     class Buffer(Protocol):
         # Not actually a Protocol at runtime; see
         # https://github.com/python/typeshed/issues/10224 for why we're defining it this way
-        def __buffer__(self, __flags: int) -> memoryview: ...
+        def __buffer__(self, flags: int, /) -> memoryview: ...
 
 if sys.version_info >= (3, 13):
     from typing import get_protocol_members as get_protocol_members, is_protocol as is_protocol
 else:
-    def is_protocol(__tp: type) -> bool: ...
-    def get_protocol_members(__tp: type) -> frozenset[str]: ...
+    def is_protocol(tp: type, /) -> bool: ...
+    def get_protocol_members(tp: type, /) -> frozenset[str]: ...
 
 class Doc:
     documentation: str
-    def __init__(self, __documentation: str) -> None: ...
+    def __init__(self, documentation: str, /) -> None: ...
     def __hash__(self) -> int: ...
     def __eq__(self, other: object) -> bool: ...