[test] verify that `()` void parses to None or is ignored #304

	# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: tests

	on:
	- push
	- pull_request

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: [
	'3.10',
	'3.11',
	]

	steps:
	- uses: actions/checkout@v2
	- name: set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: install dependencies
	run: \|
	sudo apt-get update
	sudo apt-get dist-upgrade -y
	sudo apt-get install -y pandoc
	sudo apt-get install -y python3-sphinx
	sudo apt-get install -y python3-docutils
	python -m pip install --upgrade pip
	pip install --upgrade --requirement requirements-test.txt
	- name: lint
	if: ${{ matrix.python-version == '3.10' }}
	run: \|
	make lint
	- name: pytest
	run: \|
	make tatsu_test
	- name: examples
	run: \|
	make examples
	- name: documentation
	if: ${{ matrix.python-version == '3.10' }}
	run: \|
	make documentation
	- name: distributions
	run: \|
	make sdist

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