Remove typing_extensions requirement

Author: CoolCat467

pyproject.toml

@@ -50,8 +50,6 @@ dependencies = [
     # cffi is required on Windows, except on PyPy where it is built-in
     "cffi>=1.14; os_name == 'nt' and implementation_name != 'pypy'",
     "exceptiongroup; python_version < '3.11'",
-    # using typing_extensions.depreciated in _sync.py
-    "typing_extensions >= 4.15.0",
 ]
 dynamic = ["version"]
 

src/trio/_sync.py

@@ -1,10 +1,9 @@
 from __future__ import annotations
 
 import math
-from typing import TYPE_CHECKING, Literal, Protocol
+from typing import TYPE_CHECKING, Literal, Protocol, TypeVar
 
 import attrs
-from typing_extensions import deprecated
 
 import trio
 
@@ -23,8 +22,15 @@
 if TYPE_CHECKING:
     from types import TracebackType
 
+    from typing_extensions import deprecated
+
     from ._core import Task
     from ._core._parking_lot import ParkingLotStatistics
+else:
+    T = TypeVar("T")
+
+    def deprecated(f: T) -> T:
+        return f
 
 
 @attrs.frozen

test-requirements.in

@@ -39,4 +39,3 @@ outcome
 sniffio
 # 1.2.1 fixes types
 exceptiongroup >= 1.2.1; python_version < "3.11"
-typing_extensions >= 4.15.0