Web Reference: Lower your guards: a compositional pattern-match coverage checker Simon Peyton Jones, Sebastian Graf, Ryan Scott Published in International Conference on Functional Programming (ICFP’20) View PDF Download BibTex In this talk, I will give lots of tricky examples of pattern matching, describe how to think about coverage and overlap checking, and reflect on how their new refactored implementation works. Desugar all patterns to a simple form with just bang patterns, let expressions, and destructuring. Turn the pieces of the patterns into knowledge about what has been matched, using a refinement type like description of the remaining possible values.
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