add an error test #1543

	name: Format

	on: [push]

	jobs:
	format:
	name: Check Formatting
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	- name: Install stable
	uses: actions-rs/toolchain@v1
	with:
	toolchain: 1.72.0
	override: true
	components: rustfmt, clippy
	- name: Check formatting
	uses: actions-rs/cargo@v1
	with:
	command: fmt
	args: --all -- --check
	- name: Clippy version
	uses: actions-rs/cargo@v1
	with:
	command: clippy
	args: --version
	- name: Run clippy
	uses: actions-rs/cargo@v1
	with:
	command: clippy
	args: --all --all-targets -- --deny warnings

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