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As I'm sure many readers are aware, Google+ is shutting down. This affects Yesod's authentication system. In particular, any users of the Yesod.Auth.GoogleEmail2 module will need to migrate.

Fortunately for all of us, Patrick Brisbin has written both the code for using Google Sign-in, but has also put together a great migration blog post. If you're affected, please check that out for a relatively painless migration.

Earlier today, I migrated Haskellers.com in two commits: the first did all of the work, and the second made things more future-proof.