Skip processing on closed result channel, fix panic #326

	name: CI Checks

	# run this workflow on commits and pull requests
	on:
	push:
	branches: [ master ]
	pull_request:

	jobs:
	lint:
	name: Lint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/setup-go@v3
	with:
	go-version: 1.20.x # Avoid latest here. New Go versions can break linters.
	- uses: actions/checkout@v3
	- name: golangci-lint
	uses: golangci/golangci-lint-action@v3
	with:
	version: v1.52.2

	build:
	name: Build release binaries
	runs-on: ubuntu-latest
	steps:
	- name: Use latest Go version
	uses: actions/setup-go@v3
	with:
	go-version: ^1.20

	- name: Checkout source
	uses: actions/checkout@master
	with:
	ref: ${{ github.ref }}

	- name: Build
	run: make -j8 build # '-j N' runs each build task in parallel.

	tests:
	name: Test with Go ${{ matrix.go }}
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go:
	- 1.17.x
	- 1.18.x
	- 1.19.x
	- ^1.20 # Latest version of Go
	steps:
	- name: Use Go ${{ matrix.go }}
	uses: actions/setup-go@v3
	with:
	go-version: ${{ matrix.go }}

	- name: Checkout source
	uses: actions/checkout@master
	with:
	ref: ${{ github.ref }}

	- name: Run tests
	run: make test

	- name: Report to Coveralls
	if: matrix.go == '^1.20'
	uses: shogo82148/actions-goveralls@v1
	with:
	path-to-profile: cover.out

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