cmd/go2go: shut down go2go playground

[ianlancetaylor]

The go2go playground served its purpose and is now out of date and is more confusing than helpful. It's time to shut it down.

Ideally go2goplay.golang.org should be replaced with a static page saying something along the lines of

This playground was used during the development of the generics proposal. It is now out of date and has been shut down. The generics proposal (https://golang.org/s/generics-proposal) has been accepted and (as of September 2021) is under active development aiming for inclusion in the Go 1.18 release.

CC @griesemer @golang/osp-team

[beoran]

While that is fair enough, it would be helpful to have a playground with a preview of Go 1.18 available, perhaps a recent development version. If it is not too much effort of course.

[seankhliao]

@beoran see #33629

[ianlancetaylor]

We should perhaps have the go2go playground redirect to the tip playground. Though I don't know that we have a tip playground running at this point.

CC @golang/release

[changkun]

It would be nice to serve tip, and the latest two releases, as proposal accepted in #33629

[gopherbot]

Change https://golang.org/cl/362854 mentions this issue: deploy: add deployment configuration for a tipgo playground instance

[findleyr]

@changkun I agree that would be nice, but that is a modestly sized project that unfortunately none of us have time for at the moment. It is also the case that the gotip playground will be redeployed many times a day, which may not be desirable for the non-tip playground (I'm honestly not sure if that argument holds water).

For now, I am planning to deploy gotipplay.golang.org, which will be identical to play.golang.org but using Go tip (I will probably also try to indicate this somewhere in the HTML, and change examples). For technical reasons the URL must be gotipplay.golang.org, not e.g. gotip.play.golang.org.

[findleyr]

With help from @toothrot, https://gotipplay.golang.org is deployed. Next step is to clearly identify the go version in the UI, and redirect go2go.

The plan for the latter is to just overwrite the go2go app with a simple redirector.

[griesemer]

And it works! Cool.

[ianlancetaylor]

Thanks!