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GHC 8.6.1 is live, and it comes with a fresh new batch of extensions! Specifically, you welcome `DerivingVia`, `QuantifiedConstraints`, `BlockArguments`, `NumericUnderscores`, and `StarIsType`... so why should you care? How will these affect code in the real world?

In this lightning talk, Tom will look at each one in turn and what it brings you, including a few real-world use cases, and problems (with solutions!) encountered while building them. Expect some type-level trickery, anti-boilerplate propaganda, and plenty of ways to distract yourself from #15696!

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