use builtins:variant/2 #234

	name: Test
	on: [push, pull_request]

	jobs:
	build:
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-20.04, macos-10.15]
	rust-version: [stable, beta]
	steps:
	- name: Checkout sources
	uses: actions/checkout@v2
	- name: Install Rust
	uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: ${{ matrix.rust-version }}
	override: true
	- name: Build lib
	uses: actions-rs/cargo@v1
	with:
	command: rustc
	args: --verbose --lib -- -D warnings
	- name: Build bin
	uses: actions-rs/cargo@v1
	with:
	command: rustc
	args: --verbose --bin scryer-prolog -- -D warnings
	- name: Test
	uses: actions-rs/cargo@v1
	with:
	command: test
	args: --verbose --all
	- name: Num tests
	uses: actions-rs/cargo@v1
	continue-on-error: true
	with:
	command: test
	args: --verbose --all --no-default-features --features num

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