Closes #1655 add back-compatibility to `expr_label()` for incoming `is.atomic(NULL)` change in R version 4.4 #1884

	# Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
	# Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
	#
	# NOTE: This workflow is overkill for most R packages and
	# check-standard.yaml is likely a better choice.
	# usethis::use_github_action("check-standard") will install it.
	on:
	push:
	branches: [main, master]
	pull_request:
	branches: [main, master]

	name: R-CMD-check

	jobs:
	R-CMD-check:
	runs-on: ${{ matrix.config.os }}

	name: ${{ matrix.config.os }} (${{ matrix.config.r }})

	strategy:
	fail-fast: false
	matrix:
	config:
	- {os: macos-latest, r: 'release'}

	- {os: windows-latest, r: 'release'}
	# Use 3.6 to trigger usage of RTools35
	- {os: windows-latest, r: '3.6'}
	# use 4.1 to check with rtools40's older compiler
	- {os: windows-latest, r: '4.1'}

	- {os: ubuntu-latest, r: 'devel', http-user-agent: 'release'}
	- {os: ubuntu-latest, r: 'release'}
	- {os: ubuntu-latest, r: 'oldrel-1'}
	- {os: ubuntu-latest, r: 'oldrel-2'}
	- {os: ubuntu-latest, r: 'oldrel-3'}
	- {os: ubuntu-latest, r: 'oldrel-4'}

	env:
	GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
	R_KEEP_PKG_SOURCE: yes

	steps:
	- uses: actions/checkout@v3

	- uses: r-lib/actions/setup-pandoc@v2

	- uses: r-lib/actions/setup-r@v2
	with:
	r-version: ${{ matrix.config.r }}
	http-user-agent: ${{ matrix.config.http-user-agent }}
	use-public-rspm: true

	- uses: r-lib/actions/setup-r-dependencies@v2
	with:
	extra-packages: any::rcmdcheck
	needs: check

	- uses: r-lib/actions/check-r-package@v2
	with:
	upload-snapshots: true

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