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fix `stopped_as_optional` handling of multi-value senders #837

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	clang-format:
	runs-on: ubuntu-latest
	container:
	image: silkeh/clang:21@sha256:1901d77a39a463f27463f0b0c69441ed5c8ad18cbcf33ccf37283c27e807739f
	permissions:
	contents: read
	steps:
	- run: apt update && apt --yes --no-install-recommends install git
	- uses: actions/checkout@v6
	- run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
	- shell: bash
	run: \|
	clang-format-21 --version
	git ls-files '.[ch]' '.[ch]pp' '.cu' '.cuh' \| xargs clang-format-21 --dry-run --Werror