From: Stefano Rivera <stefanor@debian.org>
Date: Fri, 6 May 2022 20:54:58 -0400
Subject: Drop dependency on typing_extensions

All the bits we need are available in Python 3.11.0. Upstream uses
typing_extensions to support older Pythons.
---
 pyproject.toml                                      | 3 +--
 src/twisted/_threads/_pool.py                       | 2 +-
 src/twisted/application/runner/test/test_pidfile.py | 2 +-
 src/twisted/conch/checkers.py                       | 2 +-
 src/twisted/conch/ssh/keys.py                       | 2 +-
 src/twisted/conch/ssh/transport.py                  | 2 +-
 src/twisted/conch/test/test_ckeygen.py              | 2 +-
 src/twisted/internet/_signals.py                    | 2 +-
 src/twisted/internet/address.py                     | 2 +-
 src/twisted/internet/defer.py                       | 2 +-
 src/twisted/internet/tcp.py                         | 4 ++--
 src/twisted/internet/test/test_base.py              | 2 +-
 src/twisted/internet/test/test_defer_await.py       | 2 +-
 src/twisted/internet/test/test_reactormixins.py     | 2 +-
 src/twisted/internet/test/test_testing.py           | 2 +-
 src/twisted/internet/testing.py                     | 2 +-
 src/twisted/internet/threads.py                     | 2 +-
 src/twisted/names/test/test_hosts.py                | 2 +-
 src/twisted/positioning/test/test_nmea.py           | 2 +-
 src/twisted/protocols/haproxy/_v2parser.py          | 2 +-
 src/twisted/python/deprecate.py                     | 2 +-
 src/twisted/python/filepath.py                      | 2 +-
 src/twisted/python/test/strategies.py               | 2 +-
 src/twisted/python/test/test_url.py                 | 2 +-
 src/twisted/python/threadpool.py                    | 2 +-
 src/twisted/python/zippath.py                       | 2 +-
 src/twisted/test/test_defer.py                      | 2 +-
 src/twisted/test/test_formmethod.py                 | 2 +-
 src/twisted/test/test_lockfile.py                   | 2 +-
 src/twisted/test/test_log.py                        | 2 +-
 src/twisted/test/test_modules.py                    | 2 +-
 src/twisted/test/test_monkey.py                     | 2 +-
 src/twisted/test/test_paths.py                      | 2 +-
 src/twisted/test/test_persisted.py                  | 2 +-
 src/twisted/test/test_randbytes.py                  | 2 +-
 src/twisted/test/test_rebuild.py                    | 2 +-
 src/twisted/trial/_asynctest.py                     | 2 +-
 src/twisted/trial/_dist/test/matchers.py            | 2 +-
 src/twisted/trial/_dist/worker.py                   | 2 +-
 src/twisted/trial/_dist/workerreporter.py           | 2 +-
 src/twisted/trial/_synctest.py                      | 2 +-
 src/twisted/trial/reporter.py                       | 2 +-
 src/twisted/trial/runner.py                         | 2 +-
 src/twisted/trial/util.py                           | 2 +-
 src/twisted/web/static.py                           | 2 +-
 src/twisted/web/test/test_xml.py                    | 2 +-
 tox.ini                                             | 1 -
 47 files changed, 47 insertions(+), 49 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index 9079b40..040cf32 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ dynamic = [
 description = "An asynchronous networking framework written in Python"
 license = { text = "MIT License" }
 # When updating this value, make sure our CI matrix includes a matching minimum version.
-requires-python = ">=3.8.0"
+requires-python = ">=3.11.0"
 authors = [
     { name = "Twisted Matrix Community", email = "twisted@python.org" },
 ]
@@ -38,7 +38,6 @@ dependencies = [
     "Automat >= 24.8.0",
     "hyperlink >= 17.1.1",
     "attrs >= 22.2.0",
-    "typing_extensions >= 4.2.0",
 ]
 
 # Switch to this when the legacy optional dependency names are removed
diff --git a/src/twisted/_threads/_pool.py b/src/twisted/_threads/_pool.py
index 99c055d..d0e1835 100644
--- a/src/twisted/_threads/_pool.py
+++ b/src/twisted/_threads/_pool.py
@@ -12,7 +12,7 @@ from queue import Queue
 from threading import Lock, Thread, local as LocalStorage
 from typing import Callable, Optional
 
-from typing_extensions import Protocol
+from typing import Protocol
 
 from twisted.python.log import err
 from ._ithreads import IWorker
diff --git a/src/twisted/application/runner/test/test_pidfile.py b/src/twisted/application/runner/test/test_pidfile.py
index 30667a3..e7d0c69 100644
--- a/src/twisted/application/runner/test/test_pidfile.py
+++ b/src/twisted/application/runner/test/test_pidfile.py
@@ -12,7 +12,7 @@ from typing import Any, Callable, Optional
 
 from zope.interface.verify import verifyObject
 
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 import twisted.trial.unittest
 from twisted.python.filepath import FilePath
diff --git a/src/twisted/conch/checkers.py b/src/twisted/conch/checkers.py
index 3ade2d8..6f4e1de 100644
--- a/src/twisted/conch/checkers.py
+++ b/src/twisted/conch/checkers.py
@@ -16,7 +16,7 @@ from typing import IO, Any, Callable, Iterable, Iterator, Mapping, Optional, Tup
 from zope.interface import Interface, implementer, providedBy
 
 from incremental import Version
-from typing_extensions import Literal, Protocol
+from typing import Literal, Protocol
 
 from twisted.conch import error
 from twisted.conch.ssh import keys
diff --git a/src/twisted/conch/ssh/keys.py b/src/twisted/conch/ssh/keys.py
index e52608d..5a4ea43 100644
--- a/src/twisted/conch/ssh/keys.py
+++ b/src/twisted/conch/ssh/keys.py
@@ -27,7 +27,7 @@ from cryptography.hazmat.primitives.serialization import (
     load_pem_private_key,
     load_ssh_public_key,
 )
-from typing_extensions import Literal
+from typing import Literal
 
 from twisted.conch.ssh import common, sexpy
 from twisted.conch.ssh.common import int_to_bytes
diff --git a/src/twisted/conch/ssh/transport.py b/src/twisted/conch/ssh/transport.py
index 323236f..ab6564d 100644
--- a/src/twisted/conch/ssh/transport.py
+++ b/src/twisted/conch/ssh/transport.py
@@ -24,7 +24,7 @@ from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import serialization
 from cryptography.hazmat.primitives.asymmetric import dh, ec, x25519
 from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
-from typing_extensions import Literal
+from typing import Literal
 
 from twisted import __version__ as twisted_version
 from twisted.conch.ssh import _kex, address, keys
diff --git a/src/twisted/conch/test/test_ckeygen.py b/src/twisted/conch/test/test_ckeygen.py
index 51f0a46..c1cc5dd 100644
--- a/src/twisted/conch/test/test_ckeygen.py
+++ b/src/twisted/conch/test/test_ckeygen.py
@@ -14,7 +14,7 @@ import os
 from io import StringIO
 from typing import Callable
 
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 from twisted.conch.test.keydata import (
     privateECDSA_openssh,
diff --git a/src/twisted/internet/_signals.py b/src/twisted/internet/_signals.py
index 18793bf..c49b980 100644
--- a/src/twisted/internet/_signals.py
+++ b/src/twisted/internet/_signals.py
@@ -44,7 +44,7 @@ from typing import Callable, Optional, Sequence
 from zope.interface import Attribute, Interface, implementer
 
 from attrs import define, frozen
-from typing_extensions import Protocol, TypeAlias
+from typing import Protocol, TypeAlias
 
 from twisted.internet.interfaces import IReadDescriptor
 from twisted.python import failure, log, util
diff --git a/src/twisted/internet/address.py b/src/twisted/internet/address.py
index d0ab1f6..b9f4532 100644
--- a/src/twisted/internet/address.py
+++ b/src/twisted/internet/address.py
@@ -13,7 +13,7 @@ from warnings import warn
 from zope.interface import implementer
 
 import attr
-from typing_extensions import Literal
+from typing import Literal
 
 from twisted.internet.interfaces import IAddress
 from twisted.python.filepath import _asFilesystemBytes, _coerceToFilesystemEncoding
diff --git a/src/twisted/internet/defer.py b/src/twisted/internet/defer.py
index 1892eb4..9dd9643 100644
--- a/src/twisted/internet/defer.py
+++ b/src/twisted/internet/defer.py
@@ -43,7 +43,7 @@ from typing import (
 
 import attr
 from incremental import Version
-from typing_extensions import Concatenate, Literal, ParamSpec, Self
+from typing import Concatenate, Literal, ParamSpec, Self
 
 from twisted.internet.interfaces import IDelayedCall, IReactorTime
 from twisted.logger import Logger
diff --git a/src/twisted/internet/tcp.py b/src/twisted/internet/tcp.py
index 7bc4d1e..cb2fba4 100644
--- a/src/twisted/internet/tcp.py
+++ b/src/twisted/internet/tcp.py
@@ -19,7 +19,7 @@ from typing import Any, Callable, ClassVar, List, Optional, Union
 from zope.interface import Interface, implementer
 
 import attr
-import typing_extensions
+import typing
 
 from twisted.internet.interfaces import (
     IHalfCloseableProtocol,
@@ -960,7 +960,7 @@ class _IFileDescriptorReservation(Interface):
         """
 
 
-class _HasClose(typing_extensions.Protocol):
+class _HasClose(typing.Protocol):
     def close(self) -> object:
         ...
 
diff --git a/src/twisted/internet/test/test_base.py b/src/twisted/internet/test/test_base.py
index 875ed01..fb521a1 100644
--- a/src/twisted/internet/test/test_base.py
+++ b/src/twisted/internet/test/test_base.py
@@ -12,7 +12,7 @@ from unittest import skipIf
 
 from zope.interface import implementer
 
-from typing_extensions import ParamSpec
+from typing import ParamSpec
 
 from twisted.internet._resolver import FirstOneWins
 from twisted.internet.base import DelayedCall, ReactorBase, ThreadedResolver
diff --git a/src/twisted/internet/test/test_defer_await.py b/src/twisted/internet/test/test_defer_await.py
index 5e2671a..23c3d0d 100644
--- a/src/twisted/internet/test/test_defer_await.py
+++ b/src/twisted/internet/test/test_defer_await.py
@@ -8,7 +8,7 @@ Tests for C{await} support in Deferreds.
 
 import types
 
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 from twisted.internet.defer import (
     Deferred,
diff --git a/src/twisted/internet/test/test_reactormixins.py b/src/twisted/internet/test/test_reactormixins.py
index a31ae29..b833bd4 100644
--- a/src/twisted/internet/test/test_reactormixins.py
+++ b/src/twisted/internet/test/test_reactormixins.py
@@ -4,7 +4,7 @@ module.
 """
 
 from hamcrest import assert_that, equal_to, has_length
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 # Trial should expose matches_result publically.
 # https://github.com/twisted/twisted/issues/11709
diff --git a/src/twisted/internet/test/test_testing.py b/src/twisted/internet/test/test_testing.py
index 58323e1..66e6e73 100644
--- a/src/twisted/internet/test/test_testing.py
+++ b/src/twisted/internet/test/test_testing.py
@@ -10,7 +10,7 @@ from typing import Callable
 
 from zope.interface.verify import verifyObject
 
-from typing_extensions import Protocol
+from typing import Protocol
 
 from twisted.internet.address import IPv4Address
 from twisted.internet.interfaces import (
diff --git a/src/twisted/internet/testing.py b/src/twisted/internet/testing.py
index a7e1de6..f79bbf7 100644
--- a/src/twisted/internet/testing.py
+++ b/src/twisted/internet/testing.py
@@ -27,7 +27,7 @@ from typing import (
 from zope.interface import implementedBy, implementer
 from zope.interface.verify import verifyClass
 
-from typing_extensions import ParamSpec, Self
+from typing import ParamSpec, Self
 
 from twisted.internet import address, error, protocol, task
 from twisted.internet.abstract import _dataMustBeBytes, isIPv6Address
diff --git a/src/twisted/internet/threads.py b/src/twisted/internet/threads.py
index e9a49cb..2e088f1 100644
--- a/src/twisted/internet/threads.py
+++ b/src/twisted/internet/threads.py
@@ -12,7 +12,7 @@ from __future__ import annotations
 import queue as Queue
 from typing import Callable, TypeVar
 
-from typing_extensions import ParamSpec
+from typing import ParamSpec
 
 from twisted.internet import defer
 from twisted.internet.interfaces import IReactorFromThreads
diff --git a/src/twisted/names/test/test_hosts.py b/src/twisted/names/test/test_hosts.py
index 972046c..2ffe0c1 100644
--- a/src/twisted/names/test/test_hosts.py
+++ b/src/twisted/names/test/test_hosts.py
@@ -6,7 +6,7 @@ Tests for the I{hosts(5)}-based resolver, L{twisted.names.hosts}.
 """
 from __future__ import annotations
 
-from typing_extensions import Protocol
+from typing import Protocol
 
 from twisted.internet.defer import gatherResults
 from twisted.names.dns import (
diff --git a/src/twisted/positioning/test/test_nmea.py b/src/twisted/positioning/test/test_nmea.py
index 6e8b5ca..f283156 100644
--- a/src/twisted/positioning/test/test_nmea.py
+++ b/src/twisted/positioning/test/test_nmea.py
@@ -12,7 +12,7 @@ from typing import Callable, Iterable, TypedDict
 from zope.interface import implementer
 
 from constantly import NamedConstant
-from typing_extensions import Literal, Protocol
+from typing import Literal, Protocol
 
 from twisted.positioning import base, ipositioning, nmea
 from twisted.positioning.base import Angles
diff --git a/src/twisted/protocols/haproxy/_v2parser.py b/src/twisted/protocols/haproxy/_v2parser.py
index cfcf7c9..bbcc7aa 100644
--- a/src/twisted/protocols/haproxy/_v2parser.py
+++ b/src/twisted/protocols/haproxy/_v2parser.py
@@ -14,7 +14,7 @@ from typing import Callable, Tuple, Type, Union
 from zope.interface import implementer
 
 from constantly import ValueConstant, Values
-from typing_extensions import Literal
+from typing import Literal
 
 from twisted.internet import address
 from twisted.python import compat
diff --git a/src/twisted/python/deprecate.py b/src/twisted/python/deprecate.py
index 22b0d16..c69dfec 100644
--- a/src/twisted/python/deprecate.py
+++ b/src/twisted/python/deprecate.py
@@ -101,7 +101,7 @@ from typing import Any, Callable, Dict, Optional, TypeVar, cast
 from warnings import warn, warn_explicit
 
 from incremental import Version, getVersionString
-from typing_extensions import ParamSpec
+from typing import ParamSpec
 
 _P = ParamSpec("_P")
 _R = TypeVar("_R")
diff --git a/src/twisted/python/filepath.py b/src/twisted/python/filepath.py
index c5feb2f..0175077 100644
--- a/src/twisted/python/filepath.py
+++ b/src/twisted/python/filepath.py
@@ -61,7 +61,7 @@ from typing import (
 
 from zope.interface import Attribute, Interface, implementer
 
-from typing_extensions import Literal
+from typing import Literal
 
 from twisted.python.compat import cmp, comparable
 from twisted.python.runtime import platform
diff --git a/src/twisted/python/test/strategies.py b/src/twisted/python/test/strategies.py
index 19cba6c..28e9b9d 100644
--- a/src/twisted/python/test/strategies.py
+++ b/src/twisted/python/test/strategies.py
@@ -6,7 +6,7 @@ Hypothesis strategies for values related to L{twisted.python}.
 """
 
 from hypothesis.strategies import SearchStrategy, characters, text
-from typing_extensions import Literal
+from typing import Literal
 
 
 def systemdDescriptorNames() -> SearchStrategy[str]:
diff --git a/src/twisted/python/test/test_url.py b/src/twisted/python/test/test_url.py
index 010761e..8e08a7e 100644
--- a/src/twisted/python/test/test_url.py
+++ b/src/twisted/python/test/test_url.py
@@ -9,7 +9,7 @@ from __future__ import annotations
 
 from typing import Iterable
 
-from typing_extensions import Protocol
+from typing import Protocol
 
 from twisted.trial.unittest import SynchronousTestCase
 from ..url import URL
diff --git a/src/twisted/python/threadpool.py b/src/twisted/python/threadpool.py
index ab5c0f1..e792ffd 100644
--- a/src/twisted/python/threadpool.py
+++ b/src/twisted/python/threadpool.py
@@ -14,7 +14,7 @@ from __future__ import annotations
 from threading import Thread, current_thread
 from typing import Any, Callable, List, Optional, TypeVar
 
-from typing_extensions import ParamSpec, Protocol, TypedDict
+from typing import ParamSpec, Protocol, TypedDict
 
 from twisted._threads import pool as _pool
 from twisted.python import context, log
diff --git a/src/twisted/python/zippath.py b/src/twisted/python/zippath.py
index 9aa9c7c..7179226 100644
--- a/src/twisted/python/zippath.py
+++ b/src/twisted/python/zippath.py
@@ -29,7 +29,7 @@ from zipfile import ZipFile
 
 from zope.interface import implementer
 
-from typing_extensions import Literal, Self
+from typing import Literal, Self
 
 from twisted.python.compat import cmp, comparable
 from twisted.python.filepath import (
diff --git a/src/twisted/test/test_defer.py b/src/twisted/test/test_defer.py
index 2ae6597..7850038 100644
--- a/src/twisted/test/test_defer.py
+++ b/src/twisted/test/test_defer.py
@@ -44,7 +44,7 @@ from typing import (
 from hamcrest import assert_that, empty, equal_to
 from hypothesis import given
 from hypothesis.strategies import integers
-from typing_extensions import assert_type
+from typing import assert_type
 
 from twisted.internet import defer, reactor
 from twisted.internet.defer import (
diff --git a/src/twisted/test/test_formmethod.py b/src/twisted/test/test_formmethod.py
index 02990de..d450dce 100644
--- a/src/twisted/test/test_formmethod.py
+++ b/src/twisted/test/test_formmethod.py
@@ -8,7 +8,7 @@ Test cases for formmethod module.
 
 from typing import Callable, Iterable
 
-from typing_extensions import Concatenate, ParamSpec
+from typing import Concatenate, ParamSpec
 
 from twisted.python import formmethod
 from twisted.trial import unittest
diff --git a/src/twisted/test/test_lockfile.py b/src/twisted/test/test_lockfile.py
index 49b779b..cc26f88 100644
--- a/src/twisted/test/test_lockfile.py
+++ b/src/twisted/test/test_lockfile.py
@@ -11,7 +11,7 @@ import errno
 import os
 from unittest import skipIf, skipUnless
 
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 from twisted.python import lockfile
 from twisted.python.reflect import requireModule
diff --git a/src/twisted/test/test_log.py b/src/twisted/test/test_log.py
index 8d8c594..843e70e 100644
--- a/src/twisted/test/test_log.py
+++ b/src/twisted/test/test_log.py
@@ -17,7 +17,7 @@ from typing import Callable, List
 
 from zope.interface import implementer
 
-from typing_extensions import Protocol
+from typing import Protocol
 
 from twisted.logger import (
     ILogObserver,
diff --git a/src/twisted/test/test_modules.py b/src/twisted/test/test_modules.py
index 1e43500..3b06af3 100644
--- a/src/twisted/test/test_modules.py
+++ b/src/twisted/test/test_modules.py
@@ -15,7 +15,7 @@ from importlib.abc import PathEntryFinder
 from types import ModuleType
 from typing import Any, Generator
 
-from typing_extensions import Protocol
+from typing import Protocol
 
 import twisted
 from twisted.python import modules
diff --git a/src/twisted/test/test_monkey.py b/src/twisted/test/test_monkey.py
index 1bef30e..8b1e0db 100644
--- a/src/twisted/test/test_monkey.py
+++ b/src/twisted/test/test_monkey.py
@@ -6,7 +6,7 @@ Tests for L{twisted.python.monkey}.
 """
 from __future__ import annotations
 
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 from twisted.python.monkey import MonkeyPatcher
 from twisted.trial import unittest
diff --git a/src/twisted/test/test_paths.py b/src/twisted/test/test_paths.py
index 71fe186..2db6057 100644
--- a/src/twisted/test/test_paths.py
+++ b/src/twisted/test/test_paths.py
@@ -20,7 +20,7 @@ from unittest import skipIf
 
 from zope.interface.verify import verifyObject
 
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 from twisted.python import filepath
 from twisted.python.filepath import FileMode, OtherAnyStr
diff --git a/src/twisted/test/test_persisted.py b/src/twisted/test/test_persisted.py
index b6711c1..84145d1 100644
--- a/src/twisted/test/test_persisted.py
+++ b/src/twisted/test/test_persisted.py
@@ -10,7 +10,7 @@ import sys
 import textwrap
 from typing import Any, Callable, List, Tuple
 
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 # Twisted Imports
 from twisted.persisted import aot, crefutil, styles
diff --git a/src/twisted/test/test_randbytes.py b/src/twisted/test/test_randbytes.py
index aea7a68..3493e74 100644
--- a/src/twisted/test/test_randbytes.py
+++ b/src/twisted/test/test_randbytes.py
@@ -8,7 +8,7 @@ from __future__ import annotations
 
 from typing import Callable
 
-from typing_extensions import NoReturn, Protocol
+from typing import NoReturn, Protocol
 
 from twisted.python import randbytes
 from twisted.trial import unittest
diff --git a/src/twisted/test/test_rebuild.py b/src/twisted/test/test_rebuild.py
index e25fa95..becbcac 100644
--- a/src/twisted/test/test_rebuild.py
+++ b/src/twisted/test/test_rebuild.py
@@ -7,7 +7,7 @@ import os
 import sys
 import types
 
-from typing_extensions import NoReturn
+from typing import NoReturn
 
 from twisted.python import rebuild
 from twisted.trial.unittest import TestCase
diff --git a/src/twisted/trial/_asynctest.py b/src/twisted/trial/_asynctest.py
index 6765c70..19d63d5 100644
--- a/src/twisted/trial/_asynctest.py
+++ b/src/twisted/trial/_asynctest.py
@@ -14,7 +14,7 @@ from typing import Callable, List
 
 from zope.interface import implementer
 
-from typing_extensions import ParamSpec
+from typing import ParamSpec
 
 # We can't import reactor at module-level because this code runs before trial
 # installs a user-specified reactor, installing the default reactor and
diff --git a/src/twisted/trial/_dist/test/matchers.py b/src/twisted/trial/_dist/test/matchers.py
index 4e86604..b171c79 100644
--- a/src/twisted/trial/_dist/test/matchers.py
+++ b/src/twisted/trial/_dist/test/matchers.py
@@ -25,7 +25,7 @@ from hamcrest.core.base_matcher import BaseMatcher
 from hamcrest.core.core.allof import AllOf
 from hamcrest.core.description import Description
 from hamcrest.core.matcher import Matcher
-from typing_extensions import Protocol
+from typing import Protocol
 
 from twisted.python.failure import Failure
 
diff --git a/src/twisted/trial/_dist/worker.py b/src/twisted/trial/_dist/worker.py
index 77e5021..bee179c 100644
--- a/src/twisted/trial/_dist/worker.py
+++ b/src/twisted/trial/_dist/worker.py
@@ -16,7 +16,7 @@ from unittest import TestCase
 from zope.interface import implementer
 
 from attrs import frozen
-from typing_extensions import Protocol, TypedDict
+from typing import Protocol, TypedDict
 
 from twisted.internet.defer import Deferred, DeferredList
 from twisted.internet.error import ProcessDone
diff --git a/src/twisted/trial/_dist/workerreporter.py b/src/twisted/trial/_dist/workerreporter.py
index f266d72..9b3cc10 100644
--- a/src/twisted/trial/_dist/workerreporter.py
+++ b/src/twisted/trial/_dist/workerreporter.py
@@ -14,7 +14,7 @@ from typing import Callable, List, Optional, Sequence, Type, TypeVar
 from unittest import TestCase as PyUnitTestCase
 
 from attrs import Factory, define
-from typing_extensions import Literal
+from typing import Literal
 
 from twisted.internet.defer import Deferred, maybeDeferred
 from twisted.protocols.amp import AMP, MAX_VALUE_LENGTH
diff --git a/src/twisted/trial/_synctest.py b/src/twisted/trial/_synctest.py
index 6b1f43d..81e61d7 100644
--- a/src/twisted/trial/_synctest.py
+++ b/src/twisted/trial/_synctest.py
@@ -36,7 +36,7 @@ from typing import (
 from unittest import SkipTest
 
 from attrs import frozen
-from typing_extensions import ParamSpec
+from typing import ParamSpec
 
 from twisted.internet.defer import Deferred, ensureDeferred
 from twisted.python import failure, log, monkey
diff --git a/src/twisted/trial/reporter.py b/src/twisted/trial/reporter.py
index 2034a83..fe35a05 100644
--- a/src/twisted/trial/reporter.py
+++ b/src/twisted/trial/reporter.py
@@ -20,7 +20,7 @@ from typing import TYPE_CHECKING, List, Optional, Tuple, Type, Union
 
 from zope.interface import implementer
 
-from typing_extensions import TypeAlias
+from typing import TypeAlias
 
 from twisted.python import log, reflect
 from twisted.python.components import proxyForInterface
diff --git a/src/twisted/trial/runner.py b/src/twisted/trial/runner.py
index ffc554e..a117f96 100644
--- a/src/twisted/trial/runner.py
+++ b/src/twisted/trial/runner.py
@@ -42,7 +42,7 @@ from typing import Callable, Generator, List, Optional, TextIO, Type, Union
 from zope.interface import implementer
 
 from attrs import define
-from typing_extensions import ParamSpec, Protocol, TypeAlias, TypeGuard
+from typing import ParamSpec, Protocol, TypeAlias, TypeGuard
 
 from twisted.internet import defer
 from twisted.python import failure, filepath, log, modules, reflect
diff --git a/src/twisted/trial/util.py b/src/twisted/trial/util.py
index a8345cc..e71953c 100644
--- a/src/twisted/trial/util.py
+++ b/src/twisted/trial/util.py
@@ -22,7 +22,7 @@ from __future__ import annotations
 from random import randrange
 from typing import Any, Callable, TextIO, TypeVar
 
-from typing_extensions import ParamSpec
+from typing import ParamSpec
 
 from twisted.internet import interfaces, utils
 from twisted.python.failure import Failure
diff --git a/src/twisted/web/static.py b/src/twisted/web/static.py
index aeffd03..c18db27 100644
--- a/src/twisted/web/static.py
+++ b/src/twisted/web/static.py
@@ -20,7 +20,7 @@ from urllib.parse import quote, unquote
 from zope.interface import implementer
 
 from incremental import Version
-from typing_extensions import Literal
+from typing import Literal
 
 from twisted.internet import abstract, interfaces
 from twisted.python import components, filepath, log
diff --git a/src/twisted/web/test/test_xml.py b/src/twisted/web/test/test_xml.py
index 468e877..bfa94e6 100644
--- a/src/twisted/web/test/test_xml.py
+++ b/src/twisted/web/test/test_xml.py
@@ -10,7 +10,7 @@ from __future__ import annotations
 from importlib import reload
 from io import BytesIO
 
-from typing_extensions import Literal
+from typing import Literal
 
 from twisted.trial.unittest import TestCase
 from twisted.web import domhelpers, microdom, sux
diff --git a/tox.ini b/tox.ini
index 764ed1b..a6ef69a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -78,7 +78,6 @@ deps =
     mindeps: Automat == 0.8.0
     mindeps: hyperlink == 17.1.1
     mindeps: attrs == 21.3.0
-    mindeps: typing_extensions == 4.2.0
     # TLS
     mindeps: pyopenssl == 21.0.0
     mindeps: service_identity == 18.1.0