`'return' in a 'finally' block` is a SyntaxWarning in Python 3.14

[Avasam]

See What’s new in Python 3.14 - PEP 765: Disallow return/break/continue that exit a finally block

When warnings are turned to errors, this is causing code like

pluggy/src/pluggy/_callers.py

Lines 110 to 141 in f8aa4a0

	finally:
	# Fast path - only new-style wrappers, no Result.
	if only_new_style_wrappers:
	if firstresult: # first result hooks return a single value
	result = results[0] if results else None
	else:
	result = results
	# run all wrapper post-yield blocks
	for teardown in reversed(teardowns):
	try:
	if exception is not None:
	teardown.throw(exception) # type: ignore[union-attr]
	else:
	teardown.send(result) # type: ignore[union-attr]
	# Following is unreachable for a well behaved hook wrapper.
	# Try to force finalizers otherwise postponed till GC action.
	# Note: close() may raise if generator handles GeneratorExit.
	teardown.close() # type: ignore[union-attr]
	except StopIteration as si:
	result = si.value
	exception = None
	continue
	except BaseException as e:
	exception = e
	continue
	_raise_wrapfail(teardown, "has second yield") # type: ignore[arg-type]
	if exception is not None:
	raise exception.with_traceback(exception.__traceback__)
	else:
	return result

to produce errors like:

=================================== FAILURES ===================================
_________________________________ test session _________________________________
[gw0] linux -- Python 3.14.0 /home/runner/work/setuptools/setuptools/.tox/py/bin/python
mypy exited with status 2.
===================================== mypy =====================================
.tox/py/lib/python3.14/site-packages/pluggy/_callers.py:141: error: 'return' in a 'finally' block  [syntax]
Found 1 error in 1 file (errors prevented further checking)

(example log: https://github.com/pypa/setuptools/actions/runs/14441580075/job/40492746262?pr=4785#step:11:75)

[RonnyPfannschmidt]

#546 might solve it
I'll crosscheck

[Avasam]

The specific "return in finally" I pointed to seems to be gone with these changes, so yeah, it might. (I didn't check if there was any other)

[henryiii]

FYI, first Python π beta is out is out! People will start testing on it. Luckily, due to where it occurs in the pytest setup, if you have:

[tool.pytest.ini_options]
filterwarnings = ["error"]

It seems it still just a warning and not an error.