Fix order of format args with warning

src/_pytest/pathlib.py

@@ -72,7 +72,7 @@ def on_rm_rf_error(func, path: str, exc, *, start_path: Path) -> bool:
             warnings.warn(
                 PytestWarning(
                     "(rm_rf) unknown function {} when removing {}:\n{}: {}".format(
-                        path, func, exctype, excvalue
+                        func, path, exctype, excvalue
                     )
                 )
             )

testing/test_tmpdir.py

@@ -388,7 +388,10 @@ class TestRmRf:
         assert not on_rm_rf_error(None, str(fn), exc_info, start_path=tmp_path)
 
         # unknown function
-        with pytest.warns(pytest.PytestWarning):
+        with pytest.warns(
+            pytest.PytestWarning,
+            match=r"^\(rm_rf\) unknown function None when removing .*foo.txt:\nNone: ",
+        ):
             exc_info = (None, PermissionError(), None)
             on_rm_rf_error(None, str(fn), exc_info, start_path=tmp_path)
             assert fn.is_file()