Drop redundant constraints, add cabal.project #34

	name: CI

	# Trigger the workflow on push or pull request, but only for the main branch
	on:
	pull_request:
	branches: [ "main" ]
	push:
	branches: [ "main" ]

	jobs:
	ghc:
	name: "GHC ${{ matrix.ghc }} on ${{ matrix.os }}"
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	ghc: ['8.10', '9.2', '9.8', '9.10', '9.12', 9.14]
	exclude:
	- os: macos-latest
	ghc: '8.10' # ghc-8.10 does not support ARM
	fail-fast: false
	steps:
	- name: Checkout base repo
	uses: actions/checkout@v4

	- name: Set up Haskell
	id: setup-haskell
	uses: haskell-actions/setup@v2
	with:
	ghc-version: ${{ matrix.ghc }}
	cabal-version: 'latest'

	- name: Configure
	run: cabal new-configure

	- name: Freeze
	run: cabal freeze

	- name: Cache
	uses: actions/cache@v4
	with:
	path: ${{ steps.setup-haskell.outputs.cabal-store }}
	key: ${{ runner.os }}-${{ matrix.ghc }}-${{ hashFiles('cabal.project.freeze') }}
	restore-keys: ${{ runner.os }}-${{ matrix.ghc }}-

	- name: Build
	run: cabal build

	mhs:
	runs-on: ubuntu-latest
	steps:
	- name: checkout mhs repo
	uses: actions/checkout@v4
	with:
	repository: augustss/MicroHs
	ref: v0.15.4.0
	path: mhs

	- name: make and install mhs
	run: \|
	cd mhs
	make minstall

	- name: checkout transformers repo
	uses: actions/checkout@v4
	with:
	path: transformers

	- name: compile and install transformers package
	run: \|
	PATH="$HOME/.mcabal/bin:$PATH"
	cd transformers
	mcabal -r install

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