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fixes a bug in contract when the two fermionic tensors have no common labels #1954

	name: clang-format Check
	on:
	pull_request:
	workflow_dispatch:

	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.run_id }}
	cancel-in-progress: ${{ github.event_name == 'pull_request' }}

	jobs:
	formatting-check:
	name: Formatting Check
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

	# When re-running a PR job, GitHub Actions uses the merge commit created at
	# the time of the original run, not a fresh merge with the latest target branch.
	# This step ensures we always test against the most recent target branch.
	# A committer identity is required because a non-fast-forward merge creates
	# a merge commit.
	- name: Merge with latest target branch (pull_request only)
	if: github.event_name == 'pull_request'
	run: \|
	git config user.name "github-actions[bot]"
	git config user.email "github-actions[bot]@users.noreply.github.com"
	git fetch origin ${{ github.event.pull_request.base.ref }}
	git merge --no-edit origin/${{ github.event.pull_request.base.ref }}

	- name: Run clang-format style check for C/C++/Protobuf programs.
	uses: jidicula/clang-format-action@v4.16.0
	with:
	clang-format-version: '14'
	check-path: '.'
	fallback-style: 'Google' # optional