Add an explicit upcast in the OO-style test. #246

	name: Ctypes

	on:
	push:
	branches:
	- master
	pull_request:
	workflow_dispatch:

	jobs:
	tests:
	name: Tests

	strategy:
	fail-fast: false
	matrix:
	include:
	- os: ubuntu-latest
	ocaml-compiler: 4.03.0
	- os: ubuntu-latest
	ocaml-compiler: 4.04.0
	- os: ubuntu-latest
	ocaml-compiler: 4.05.0
	- os: ubuntu-latest
	ocaml-compiler: 4.06.0
	- os: ubuntu-latest
	ocaml-compiler: 4.07.0
	- os: ubuntu-latest
	ocaml-compiler: 4.08.0
	- os: ubuntu-latest
	ocaml-compiler: 4.09.0
	- os: ubuntu-latest
	ocaml-compiler: ocaml-variants.4.11.2+fp+flambda
	- os: ubuntu-latest
	ocaml-compiler: 4.11.1
	- os: ubuntu-latest
	ocaml-compiler: 4.12.0
	- os: ubuntu-latest
	ocaml-compiler: 4.13.1
	- os: ubuntu-latest
	ocaml-compiler: 4.14.0
	- os: ubuntu-latest
	ocaml-compiler: 5.0.0
	- os: ubuntu-latest
	ocaml-compiler: 5.1.0
	- os: ubuntu-latest
	ocaml-compiler: 5.2.0
	- os: windows-latest
	ocaml-compiler: 4.13.1
	- os: macos-latest
	ocaml-compiler: 4.13.1

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

	steps:
	- name: Checkout code
	uses: actions/checkout@v4

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

	- name: Deps
	run: \|
	opam pin add -n ctypes.dev .
	opam pin add -n ctypes-foreign.dev .
	opam depext -ty ctypes ctypes-foreign
	opam install -t --deps-only .

	- name: Build
	run: opam exec -- dune build

	- name: Test
	run: opam exec -- dune runtest

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