Remove `PytestRemovedIn8Warning`

Per our deprecation policy.

doc/en/changelog.rst

@@ -227,7 +227,7 @@ These are breaking changes where deprecation was not possible.
 Deprecations
 ------------
 
-- `#10465 <https://github.com/pytest-dev/pytest/issues/10465>`_: Test functions returning a value other than ``None`` will now issue a :class:`pytest.PytestWarning` instead of :class:`pytest.PytestRemovedIn8Warning`, meaning this will stay a warning instead of becoming an error in the future.
+- `#10465 <https://github.com/pytest-dev/pytest/issues/10465>`_: Test functions returning a value other than ``None`` will now issue a :class:`pytest.PytestWarning` instead of ``pytest.PytestRemovedIn8Warning``, meaning this will stay a warning instead of becoming an error in the future.
 
 
 - `#3664 <https://github.com/pytest-dev/pytest/issues/3664>`_: Applying a mark to a fixture function now issues a warning: marks in fixtures never had any effect, but it is a common user error to apply a mark to a fixture (for example ``usefixtures``) and expect it to work.

doc/en/reference/reference.rst

@@ -1207,9 +1207,6 @@ Custom warnings generated in some situations such as improper usage or deprecate
 .. autoclass:: pytest.PytestReturnNotNoneWarning
   :show-inheritance:
 
-.. autoclass:: pytest.PytestRemovedIn8Warning
-  :show-inheritance:
-
 .. autoclass:: pytest.PytestRemovedIn9Warning
   :show-inheritance:
 

src/_pytest/warning_types.py

@@ -49,12 +49,6 @@ class PytestDeprecationWarning(PytestWarning, DeprecationWarning):
     __module__ = "pytest"
 
 
-class PytestRemovedIn8Warning(PytestDeprecationWarning):
-    """Warning class for features that will be removed in pytest 8."""
-
-    __module__ = "pytest"
-
-
 class PytestRemovedIn9Warning(PytestDeprecationWarning):
     """Warning class for features that will be removed in pytest 9."""
 

src/_pytest/warnings.py

@@ -46,7 +46,8 @@ def catch_warnings_for_item(
             warnings.filterwarnings("always", category=DeprecationWarning)
             warnings.filterwarnings("always", category=PendingDeprecationWarning)
 
-        warnings.filterwarnings("error", category=pytest.PytestRemovedIn8Warning)
+        # To be enabled in pytest 9.0.0.
+        # warnings.filterwarnings("error", category=pytest.PytestRemovedIn9Warning)
 
         apply_warning_filters(config_filters, cmdline_filters)
 

src/pytest/__init__.py

@@ -73,7 +73,6 @@ from _pytest.warning_types import PytestCollectionWarning
 from _pytest.warning_types import PytestConfigWarning
 from _pytest.warning_types import PytestDeprecationWarning
 from _pytest.warning_types import PytestExperimentalApiWarning
-from _pytest.warning_types import PytestRemovedIn8Warning
 from _pytest.warning_types import PytestRemovedIn9Warning
 from _pytest.warning_types import PytestReturnNotNoneWarning
 from _pytest.warning_types import PytestUnhandledCoroutineWarning
@@ -137,7 +136,6 @@ __all__ = [
     "PytestConfigWarning",
     "PytestDeprecationWarning",
     "PytestExperimentalApiWarning",
-    "PytestRemovedIn8Warning",
     "PytestRemovedIn9Warning",
     "PytestReturnNotNoneWarning",
     "Pytester",

testing/test_warnings.py

@@ -518,8 +518,7 @@ class TestDeprecationWarningsByDefault:
         assert WARNINGS_SUMMARY_HEADER not in result.stdout.str()
 
 
-# In 8.1, uncomment below and change RemovedIn8 -> RemovedIn9.
-# @pytest.mark.skip("not relevant until pytest 9.0")
+@pytest.mark.skip("not relevant until pytest 9.0")
 @pytest.mark.parametrize("change_default", [None, "ini", "cmdline"])
 def test_removed_in_x_warning_as_error(pytester: Pytester, change_default) -> None:
     """This ensures that PytestRemovedInXWarnings raised by pytest are turned into errors.
@@ -531,7 +530,7 @@ def test_removed_in_x_warning_as_error(pytester: Pytester, change_default) -> No
         """
         import warnings, pytest
         def test():
-            warnings.warn(pytest.PytestRemovedIn8Warning("some warning"))
+            warnings.warn(pytest.PytestRemovedIn9Warning("some warning"))
     """
     )
     if change_default == "ini":
@@ -539,12 +538,12 @@ def test_removed_in_x_warning_as_error(pytester: Pytester, change_default) -> No
             """
             [pytest]
             filterwarnings =
-                ignore::pytest.PytestRemovedIn8Warning
+                ignore::pytest.PytestRemovedIn9Warning
         """
         )
 
     args = (
-        ("-Wignore::pytest.PytestRemovedIn8Warning",)
+        ("-Wignore::pytest.PytestRemovedIn9Warning",)
         if change_default == "cmdline"
         else ()
     )