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Haskell programs make use of overloading extensively. As a consequence, qualified types, i.e., types containing class constraints are ubiquitous. In this talk, you will discover how a type system with type classes works internally, and how a compiler such as GHC deals with the presence of qualified types. You will explore the basics of the "dictionary translation", and how it is applied during type checking.
If you are a Haskell beginner who would like to learn more about how the Haskell type system works, this talk is for you! You would also have lots to learn if you are more advanced in the language.
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Andres Löh is a long-time functional programming enthusiast. He has started using Haskell in 1997 while being an undergraduate studying mathematics. He obtained his PhD on datatype-generic programming using Haskell from Utrecht University in 2004. Since then, he has continued to use Haskell in research and practice, including teaching various courses both to students and participants from industry. His main interests, next to datatype-generic programming, are embedded domain-specific languages, unleashing the full power of Haskell's type system, parallelism and applying functional languages to real-life problems. Since 2010, Andres is an independent Haskell consultant and partner at Well-Typed LLP.