Unify error handling with static error variables #16

	name: Go
	permissions:
	contents: read
	on:
	push:
	branches:
	- main
	pull_request:
	workflow_dispatch:
	jobs:

	build:
	strategy:
	matrix:
	go-version: ['stable', 'oldstable']
	os: [ubuntu-latest, macos-latest, windows-latest]
	runs-on: ${{ matrix.os }}

	steps:
	- name: Check out code into the Go module directory
	uses: actions/checkout@v4
	- name: Install Go
	if: success()
	uses: actions/setup-go@v5
	with:
	go-version: ${{ matrix.go-version }}
	cache: true

	- name: Run tests
	run: \|
	go test -v ./...
	go test -race -v ./...
	go vet ./...

	- name: Check mod tidy
	run: \|
	go mod tidy
	git diff --exit-code go.mod go.sum

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