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Sat 25 Jan 2020 16:50 - 17:20 at Orleans - Analysis, verification, blame Chair(s): Niki Vazou

This paper introduces λdB, a blame calculus with dependent types. It supports dependent functions, predicate refinement at all types, the dynamic type, and full blame tracking. It is inspired by and extends previous work on hybrid types and Sage, by Flanagan and others; manifest contracts, by Greenberg, Pierce, and Weyrich; and blame calculus by Wadler and Findler. While previous work only allows refinement over base types, λdB supports refinement over any type. We introduce novel techniques in order to prove blame safety for this language, including a careful analysis that reduces open judgments on terms to closed ones on values, and the idea of ‘subtyping with a witness’, which fix flaws in the previous work of Wadler and Findler. These technical contributions mean that we can achieve a completely inductive (finitistic) account of the metatheory of our language, and thereby avoid many of the subtle technical issues which have bedevilled earlier work in this area.

Sat 25 Jan
Times are displayed in time zone: (GMT-06:00) Saskatchewan, Central America change

15:35 - 17:45: WGT - Analysis, verification, blame at Orleans
Chair(s): Niki VazouIMDEA Software Institute
wgt-2020-papers15:35 - 16:07
Jenna WiseCarnegie Mellon University, Johannes BaderFacebook, Jonathan AldrichCarnegie Mellon University, Éric TanterUniversity of Chile, Joshua SunshineCarnegie Mellon University
wgt-2020-papers16:07 - 16:40
Samuel EstepLiberty University, Jenna WiseCarnegie Mellon University, Jonathan AldrichCarnegie Mellon University, Éric TanterUniversity of Chile, Johannes BaderFacebook, Joshua SunshineCarnegie Mellon University
wgt-2020-papers16:40 - 16:50
wgt-2020-papers16:50 - 17:20
Jakub ZalewskiUniversity of Edinburgh, James McKinnaUniversity of Edinburgh, J. Garrett MorrisUniversity of Kansas, USA, Philip WadlerUniversity of Edinburgh, UK
wgt-2020-papers17:20 - 17:45
Day closing