Fix pattern matching with `case None` branches. #459

	name: CI (Windows)

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]
	workflow_dispatch:

	jobs:
	build:
	strategy:
	matrix:
	os: [windows-latest]
	python-url: ['https://www.python.org/ftp/python/3.10.5/python-3.10.5-amd64.exe']
	experimental: [true]

	runs-on: ${{ matrix.os }}

	steps:
	- name: Cancel previous
	uses: styfle/[email protected]
	with:
	access_token: ${{ github.token }}

	- uses: actions/checkout@v4
	with:
	submodules: true

	- name: Download Python
	run: Invoke-WebRequest -Uri ${{ matrix.python-url }} -OutFile python-installer.exe

	- name: Install Python
	run: .\python-installer /quiet /passive Include_debug=1 PrependPath=1 TargetDir=C:\Python \| more

	- uses: ilammy/msvc-dev-cmd@v1

	# We have to put continue-on-error at the step level rather than the job
	# level because the UI is broken:
	# https://github.com/github-community/community/discussions/15452.

	- name: Test
	run: \|
	set LIB=C:\Python\Libs;%LIB%
	set TYPESHED_HOME=%cd%\typeshed
	set PATH=C:\Python;C:\Python\Scripts;%PATH%
	pip install -r requirements.txt
	python build_scripts/ci_script.py
	shell: cmd
	continue-on-error: ${{ matrix.experimental }}

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