Lots of compilation warnings since update to Emacs 29 about cider HOT 4 OPEN

(probably it's not a good idea to lint for our entire matrix - I think I've seen issues that if solved for one version, then create an issue for a different version, and so on)

I agreed. Generally it's best to lint only on the latest supported version, at typically the lint warning are accretive anyways.

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Somewhat relatedly: I might suggest adding Emacs HEAD to the matrix too, but allowing failures for that version. Then you kinda get a heads-up about potential future issues. I noticed that sesman doesn't compile in current Emacs HEAD, for example, so Cider is uninstallable there. It could be an Emacs bug, but who knows?

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Hmm, I thought we had done it, but I guess this changed amidst all the CI tweaks. It's always a good idea.

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Thanks much for the heads up. As far as CircleCI goes, we run test-lint only in Emacs 28. It seems about time that we run it for 29 instead.

(probably it's not a good idea to lint for our entire matrix - I think I've seen issues that if solved for one version, then create an issue for a different version, and so on)

@ikappaki may enjoy fixing this, but that's only an invitation :)

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