Type inference with constrained types
Theory and Practice of Object Systems - Special issue on foundations of object-oriented languages
Compositional explanation of types and algorithmic debugging of type errors
Proceedings of the sixth ACM SIGPLAN international conference on Functional programming
Haskell '03 Proceedings of the 2003 ACM SIGPLAN workshop on Haskell
ACM Transactions on Programming Languages and Systems (TOPLAS)
Type classes as objects and implicits
Proceedings of the ACM international conference on Object oriented programming systems languages and applications
Improving type error messages for generic Java
Higher-Order and Symbolic Computation
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Dealing with statically-typed languages and their complex type systems is problematic for programmers of all levels. Resolving confusing type errors is a time consuming and not always successful process. In this tool demonstration we give an overview of Scalad, an interactive tool that can explain decisions made by the existing typechecker of a multi-paradigm programming language by visualizing the whole process in the form of a proof tree. The tool works for both type correct and incorrect programs, making it suitable for educational purposes as well as debugging. We provide examples on how the tool can be used to understand typing puzzles. The debugger comes with an expandable search mechanism that can precisely guide users in finding answers to the typechecking problems and improve exploration time.