Wire Once, Rewire Twice

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This talk will show how Eric approached this problem, started solving it with 2 simple type classes and a bit of Template Haskell but then came up with a much more simple way, relying on just one data structure!

Not only this makes reconfiguring applications a breeze but the same technique can be applied to Hedgehog generators where you can define a "compositional language" to modify existing generators for nested data structures. You can now express things like "generate a model of shoe with only the colour blue and 2 sizes

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