fix: recurse only on referential nodes #129

	name: ci

	on:
	push:
	branches: [master]
	pull_request:
	branches: [master]

	env:
	CARGO_TERM_COLOR: always

	jobs:
	check:
	name: Check
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: 1.72.0
	override: true
	- uses: actions-rs/cargo@v1
	with:
	command: tree
	- uses: actions-rs/cargo@v1
	with:
	command: check

	test:
	name: Test Suite
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: 1.72.0
	override: true
	- uses: actions-rs/cargo@v1
	with:
	command: test

	fmt:
	name: Rustfmt
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: 1.72.0
	override: true
	- run: rustup component add rustfmt
	- uses: actions-rs/cargo@v1
	with:
	command: fmt
	args: --all -- --check

	clippy:
	name: Clippy
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: actions-rs/toolchain@v1
	with:
	profile: minimal
	toolchain: 1.72.0
	override: true
	- run: rustup component add clippy
	- uses: actions-rs/cargo@v1
	with:
	command: clippy
	args: -- -D warnings

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