go: Can't upgrade messages

[mpkorstanje]

🤔 What's the problem you've observed?

Trying to upgrade the messages used in Gherkin I run into this problem:

The released code sits in a sub directory named go that has been tagged go/v21.0.1 here https://github.com/cucumber/messages/tree/go/v21.0.1/go. When I try to require this using:

require (
	github.com/cucumber/messages/go/v21 v21.0.1
)

And then go get I got:

go: github.com/cucumber/messages/go/v21@v21.0.1: verifying go.mod: github.com/cucumber/messages/go/v21@v21.0.1/go.mod: reading https://sum.golang.org/lookup/github.com/cucumber/messages/go/v21@v21.0.1: 404 Not Found
        server response: not found: github.com/cucumber/messages/go/v21@v21.0.1: invalid version: unknown revision go/v21.0.1

Tagging with v21.0.1 also doesn't work.

[mpkorstanje]

Looks like sum.golang.org was just slow. Can be resolved by using: GONOPROXY=none

https://github.com/goproxyio/goproxy.io/blob/master/content/docs/GOPRIVATE-env.md