Fix #255: suppress additional warnings: tabs, unused-imports #58

	name: Build
	on:
	push:
	branches:
	- master
	- ci-*
	- release-*
	pull_request:
	branches:
	- master
	- ci-*
	- release-*

	defaults:
	run:
	shell: bash

	jobs:
	main:
	name: GHC ${{ matrix.ghc }} on ${{ matrix.os }}
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest]
	ghc:
	- "8.0.2"
	# Andreas, 2023-06-20, reduce CI load, keep only extremal GHC versions
	# - "8.2.2"
	# - "8.4.4"
	# - "8.6.5"
	# - "8.8.4"
	# - "8.10.7"
	# - "9.0.2"
	# - "9.2.8"
	- "9.4.8"
	- "9.6.3"
	- "9.8.1"
	include:
	- ghc: "9.8.1"
	os: macos-latest
	- ghc: "9.8.1"
	os: windows-latest

	steps:
	- uses: actions/checkout@v4

	- uses: haskell-actions/setup@v2
	id: setup-haskell-cabal
	with:
	ghc-version: ${{ matrix.ghc }}
	cabal-version: "latest"
	cabal-update: true

	- uses: actions/cache@v3
	name: Cache cabal stuff
	with:
	path: \|
	${{ steps.setup-haskell-cabal.outputs.cabal-store }}
	dist-newstyle
	key: ${{ runner.os }}-${{ matrix.ghc }}

	- name: Versions
	run: \|
	cabal --version

	- name: Install alex & happy
	run: \|
	cd ../
	cabal install alex happy

	- name: Unpack
	run: \|
	cp src/Parser.y src/Parser.y.boot
	cp src/Scan.x src/Scan.x.boot
	cabal sdist --ignore-project --output-directory .
	cabal get alex-*.tar.gz

	- name: Build
	run: \|
	cd alex-*/
	cabal build all --enable-tests --enable-benchmarks

	- name: Test
	run: \|
	cd alex-*/
	export ALEX=$(cabal list-bin alex)
	cabal run --enable-tests alex:test:tests

	- name: Haddock
	run: \|
	cd alex-*/
	cabal haddock --disable-documentation --haddock-all all

	- name: Cabal check
	run: \|
	cd alex-*/
	cabal check

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