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We show how to implement a parser combinator library in Haskell capable of parsing arbitrary context-free grammars. The library is based on the work of Might et al. on parsing with derivatives, [15] of which we derive the required results from a single Galois connection. The library improves upon the previous Haskell implementation [5] with regards to completeness, safety and documentation; we can handle any grammar and use generalized tries for memoization instead of unsafe IO. However, our implementation shows severe performance issues. We describe these issues and possible solutions where applicable.

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