Fix support for pytest-main.

Fixes #323

Author: icemac

CHANGES.rst

@@ -7,6 +7,10 @@ Changelog
 - Fix missing teardown for session and module scoped fixtures when fixture teardown fails.
   Fixes `#314 <https://github.com/pytest-dev/pytest-rerunfailures/issues/314>`_.
 
+- Clear fixture finalizers when removing cached results from failed fixtures
+  to fix compatibility with pytest >= 9, which asserts that ``_finalizers`` is
+  empty before executing a fixture.
+
 
 16.1 (2025-10-10)
 -----------------

src/pytest_rerunfailures.py

@@ -244,6 +244,11 @@ def _remove_cached_results_from_failed_fixtures(item):
                 result, _, err = getattr(fixture_def, cached_result)
                 if err:  # Deleting cached results for only failed fixtures
                     setattr(fixture_def, cached_result, None)
+                    # Clear finalizers registered during the failed execution
+                    # so the fixture can be re-executed cleanly (pytest >= 9
+                    # asserts _finalizers is empty before executing a fixture).
+                    if hasattr(fixture_def, "_finalizers"):
+                        fixture_def._finalizers.clear()
 
 
 def _remove_failed_setup_state_from_session(item):