gh-111729: update generic syntax for `typing.Concatenate` sample code in `Doc/library...

use new generic syntax

diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
index f82f53514a71dc0f46bff85bf9983b87739a691c..a4767d222d0af79a60be7f301a75f931220d2884 100644 (file)
--- a/Doc/library/typing.rst
+++ b/Doc/library/typing.rst
@@ -1145,16 +1145,13 @@ These can be used as types in annotations. They all support subscription using
 
       from collections.abc import Callable
       from threading import Lock
-      from typing import Concatenate, ParamSpec, TypeVar
-
-      P = ParamSpec('P')
-      R = TypeVar('R')
+      from typing import Concatenate
 
       # Use this lock to ensure that only one thread is executing a function
       # at any time.
       my_lock = Lock()
 
-      def with_lock(f: Callable[Concatenate[Lock, P], R]) -> Callable[P, R]:
+      def with_lock[**P, R](f: Callable[Concatenate[Lock, P], R]) -> Callable[P, R]:
           '''A type-safe decorator which provides a lock.'''
           def inner(*args: P.args, **kwargs: P.kwargs) -> R:
               # Provide the lock as the first argument.