Parenthesize singleton yield tuples #5495

	name: Lint

	on: [push, pull_request]

	jobs:
	build:
	# We want to run on external PRs, but not on our own internal PRs as they'll be run
	# by the push to the branch. Without this if check, checks are duplicated since
	# internal PRs match both the push and pull_request events.
	if:
	github.event_name == 'push' \|\| github.event.pull_request.head.repo.full_name !=
	github.repository

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- name: Assert PR target is main
	if: github.event_name == 'pull_request' && github.repository == 'psf/black'
	run: \|
	if [ "$GITHUB_BASE_REF" != "main" ]; then
	echo "::error::PR targeting '$GITHUB_BASE_REF', please refile targeting 'main'." && exit 1
	fi

	- name: Set up latest Python
	uses: actions/setup-python@v4
	with:
	python-version: "*"

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -e '.[d]'
	python -m pip install tox

	- name: Run pre-commit hooks
	uses: pre-commit/[email protected]

	- name: Format ourselves
	run: \|
	tox -e run_self

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