Migrate modality annotations into the parsetree #12341

	name: ocamlformat
	on:
	push:
	branches:
	- main
	pull_request:
	jobs:
	build:
	runs-on: ${{ matrix.os }}

	strategy:
	matrix:
	os: [ubuntu-latest]
	ocaml-compiler:
	- "4.14.0"

	steps:
	- name: Checkout the Flambda backend repo
	uses: actions/checkout@master
	with:
	path: 'flambda_backend'

	- name: Setup OCaml ${{ matrix.ocaml-compiler }}
	uses: ocaml/setup-ocaml@v2
	with:
	ocaml-compiler: ${{ matrix.ocaml-compiler }}

	- name: Install a recent version of re
	run: opam install 're>=1.10.0'

	- name: Install ocamlformat 0.24.1
	run: opam pin -y ocamlformat 0.24.1

	- name: autoconf
	working-directory: flambda_backend
	run: autoconf

	- name: configure
	working-directory: flambda_backend
	run: \|
	./configure \
	--prefix=$GITHUB_WORKSPACE/_install \
	--enable-middle-end=flambda2 \
	--with-dune=/bin/false

	- name: Check formatting of Flambda 2 and Cfg code
	working-directory: flambda_backend
	run: opam exec -- make check-fmt

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