Add NamedTuple __match_args__ attribute (#15906)

Author: charliermarsh

stdlib/_typeshed/_type_checker_internals.pyi

@@ -63,6 +63,7 @@ class TypedDictFallback(Mapping[str, object], metaclass=ABCMeta):
 class NamedTupleFallback(tuple[Any, ...]):
     _field_defaults: ClassVar[dict[str, Any]]
     _fields: ClassVar[tuple[str, ...]]
+    __match_args__: ClassVar[tuple[str, ...]] = ...
     # __orig_bases__ sometimes exists on <3.12, but not consistently
     # So we only add it to the stub on 3.12+.
     if sys.version_info >= (3, 12):

stdlib/typing.pyi

@@ -1049,6 +1049,7 @@ if sys.version_info >= (3, 11):
 class NamedTuple(tuple[Any, ...]):
     _field_defaults: ClassVar[dict[str, Any]]
     _fields: ClassVar[tuple[str, ...]]
+    __match_args__: ClassVar[tuple[str, ...]] = ...
     # __orig_bases__ sometimes exists on <3.12, but not consistently
     # So we only add it to the stub on 3.12+.
     if sys.version_info >= (3, 12):