Blame for all

Amal Ahmed, Robert Bruce Findler, Jacob Matthews, Philip Wadler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

We present a language that integrates statically and dynamically typed components, similar to the gradual types of Siek and Taha (2006), and extend it to incorporate parametric polymorphism. Our system permits a dynamically typed value to be cast to a polymorphic type, with the type enforced by dynamic sealing along the lines proposed by Pierce and Sumii (2000), Matthews and Ahmed(2008), and Neis, Dreyer, and Rossberg (2009), in a way that ensures all terms satisfy relational parametricity. Our system includes a notion of blame, which allows us to show that when more-typed and less-typed portions of a program interact, that any type failures are due to the less-typed portion.
Original languageEnglish
Title of host publicationWorkshop on Script to Program Evolution (STOP)
Number of pages13
Publication statusPublished - 2009


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