pytest calls the deprecated writter in itself

[gaborbernat]

within virtualenv test suite 👍 pytest 6.0.0

 /.pyenv/versions/3.8.5/lib/python3.8/runpy.py(194)_run_module_as_main()
-> return _run_code(code, main_globals, None,
  /.pyenv/versions/3.8.5/lib/python3.8/runpy.py(87)_run_code()
-> exec(code, run_globals)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/coverage/__main__.py(8)<module>()
-> sys.exit(main())
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/coverage/cmdline.py(865)main()
-> status = CoverageScript().command_line(argv)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/coverage/cmdline.py(582)command_line()
-> return self.do_run(options, args)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/coverage/cmdline.py(740)do_run()
-> runner.run()
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/coverage/execfile.py(247)run()
-> exec(code, main_mod.__dict__)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pytest/__main__.py(7)<module>()
-> raise SystemExit(pytest.console_main())
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/config/__init__.py(180)console_main()
-> code = main()
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/config/__init__.py(157)main()
-> ret = config.hook.pytest_cmdline_main(
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/hooks.py(286)__call__()
-> return self._hookexec(self, self.get_hookimpls(), kwargs)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/manager.py(93)_hookexec()
-> return self._inner_hookexec(hook, methods, kwargs)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/manager.py(84)<lambda>()
-> self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/callers.py(187)_multicall()
-> res = hook_impl.function(*args)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/main.py(289)pytest_cmdline_main()
-> return wrap_session(config, _main)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/main.py(238)wrap_session()
-> config.hook.pytest_sessionstart(session=session)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/hooks.py(286)__call__()
-> return self._hookexec(self, self.get_hookimpls(), kwargs)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/manager.py(93)_hookexec()
-> return self._inner_hookexec(hook, methods, kwargs)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/manager.py(84)<lambda>()
-> self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/callers.py(187)_multicall()
-> res = hook_impl.function(*args)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/fixtures.py(116)pytest_sessionstart()
-> session._fixturemanager = FixtureManager(session)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/fixtures.py(1463)__init__()
-> session.config.pluginmanager.register(self, "funcmanage")
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/config/__init__.py(424)register()
-> ret = super().register(plugin, name)  # type: Optional[str]
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/manager.py(127)register()
-> hook._maybe_apply_history(hookimpl)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/hooks.py(333)_maybe_apply_history()
-> res = self._hookexec(self, [method], kwargs)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/manager.py(93)_hookexec()
-> return self._inner_hookexec(hook, methods, kwargs)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/manager.py(84)<lambda>()
-> self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/pluggy/callers.py(187)_multicall()
-> res = hook_impl.function(*args)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/fixtures.py(1519)pytest_plugin_registered()
-> self.parsefactories(plugin, nodeid)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/fixtures.py(1634)parsefactories()
-> obj = safe_getattr(holderobj, name, None)
  /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/compat.py(340)safe_getattr()
-> return getattr(object, name, default)
> /git/github/virtualenv/.tox/py38/lib/python3.8/site-packages/_pytest/terminal.py(345)writer()
-> warnings.warn(TERMINALWRITER_WRITER, stacklevel=2)

/git/github/virtualenv/.tox/dev/lib/python3.8/site-packages/_pytest/compat.py:340: PytestDeprecationWarning: The TerminalReporter.writer attribute is deprecated, use TerminalReporter._tw instead at your own risk.
See https://docs.pytest.org/en/stable/deprecations.html#terminalreporter-writer for more information.
  return getattr(object, name, default)
============================================================================================================================= test session starts ==============================================================================================================================
platform darwin -- Python 3.8.5, pytest-6.0.0, py-1.9.0, pluggy-0.13.1
Using --randomly-seed=3450123479
rootdir: /Users/bgabor8/git/github/virtualenv, configfile: setup.cfg
plugins: freezegun-0.4.2, randomly-3.4.1, env-0.6.2, mock-3.2.0, flaky-3.7.0, xdist-1.34.0, timeout-1.4.2, forked-1.3.0, xonsh-0.9.18
collected 1 item

Seems the warning is triggered when pytest is registering the TerminalReporter plugin, which checks if any of the attributes are of type FixtureFunctionMarker 🤔

[The-Compiler]

Duplicate of #6936