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Formal foundations for GADTs in Scala

2020
Student project
Abstract

GADTs are a very useful language feature that allow encoding some invariants in types. GADT reasoning is currently implemented in Scala and Dotty, but it’s plagued with soundness issues. To get a better understanding of GADTs in Scala, we explore how they can be encoded in pDOT, a calculus that is the formal foundation of the Scala programming language, and show a sketch of encoding a calculus containing GADTs to pDOT.

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