Format symmetric list concatenations in preview #9155

	name: lint and format

	on: [push, pull_request]

	permissions: {}

	env:
	PIP_UPLOADED_PRIOR_TO: P2D

	jobs:
	lint:
	# 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@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
	with:
	persist-credentials: false

	- 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 Python
	uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
	with:
	python-version: "3.15"
	allow-prereleases: true

	- name: Install dependencies
	run: python -m pip install -e . --group tox

	- name: Run pre-commit hooks
	uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1

	- name: Format ourselves
	run: tox -e run_self

	- name: Regenerate schema
	run: \|
	tox -e generate_schema
	git diff --exit-code

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