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Prototyping Generic Programming using Template Haskell

The design space of generic programming languages is largely unexplored, partly due to the time and effort required to implement such a language. In this paper we show how to write flexible prototype implementations of two existing generic programming languages, PolyP and Generic Haskell, using Template Haskell

The original template haskell paper showed how to wrtie printf and zipN, which are (or used to be) cited as dependent type examples -- what other haskell
extensions can we write without compiler hacking?