Deriving Worlds
types as deriving configurations
Coding in modern Haskell can be a matter of modelling the problem domain with data and newtype declarations, then deriving the systems needed to assemble the application, possibly with TemplateHaskell.
Originally the mechanism was used strictly for generating instances for a few Prelude classes, but with the development of generics has become a structuring mechanism for building packages and applications.
How cool is that!
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