Stack should check current version and warn.

[bitemyapp]

Stack update, setup, other things will sometimes fail if you are running an ancient version. I find myself asking people what version they're running and helping them upgrade from time to time. Often this is because they apt-get'd it rather than going to haskellstack.org, but not always.

Ideally Stack would warn you when you're running an old version and tell you how to upgrade from the official website. I think there's precedent for this with Homebrew.

[borsboom]

Quite a lot of tools do this. Terraform and minikube are a couple of others I can think of off the top of my head. The main thing is that such a check shouldn't slow things down and shouldn't be done too often.

[mgsloan]

Yep this is a good idea. Closing as a duplicate of #1681

Unfortunately, not much that can be done about the old versions of course, as they will always lack the check. Makes sense to implement it soon, since a few years from now today's version will be the old version.