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On Polymorphic Gradual Typing

Series
International Conference on Functional Programming 2017
Video Embed
Yuu Igarashi (Kyoto University, Japan) gives the second talk in the fourth panel, Integrating Static and Dynamic Typing, on the 3rd day of the ICFP conference.
Co-written by Taro Sekiyama (IBM Research, Japan), Atsushi Igarashi (Kyoto University, Japan).

We study an extension of gradual typing--a method to integrate dynamic typing and static typing smoothly in a single language--to parametric polymorphism and its theoretical properties, including conservativity of typing and semantics over both statically and dynamically typed languages, type safety, blame-subtyping theorem, and the gradual guarantee--the so-called refined criteria, advocated by Siek et al. We develop System F-G, which is a gradually typed extension of System F with the dynamic type and a new type consistency relation, and translation to a new polymorphic blame calculus System F-C, which is based on previous polymorphic blame calculi by Ahmed et al. The design of System F-G and System F-C, geared to the criteria, is influenced by the distinction between static and gradual type variables, first observed by Garcia and Cimini. This distinction is also useful to execute statically typed code without incurring additional overhead to manage type names as in the prior calculi. We prove that System F-G satisfies most of the criteria: all but the hardest property of the gradual guarantee on semantics. We show that a key conjecture to prove the gradual guarantee leads to the Jack-of-All-Trades property, conjectured as an important property of the polymorphic blame calculus by Ahmed et al.

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International Conference on Functional Programming 2017

Theorems for Free for Free: Parametricity, With and Without Types

Amal Ahmed (Northeastern University, USA) gives the first talk in the fourth panel, Integrating Static and Dynamic Typing, on the 3rd day of the ICFP conference.
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International Conference on Functional Programming 2017

Gradual Typing with Union and Intersection Types

Victor Lanvin (ENS Cachan, France) gives the third talk in the fourth panel, Integrating Static and Dynamic Typing, on the 3rd day of the ICFP conference.
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Licence
Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Episode Information

Series
International Conference on Functional Programming 2017
People
Yuu Igarashi
Keywords
technology
computing
programming
Department: Department of Computer Science
Date Added: 22/01/2018
Duration: 18:04:00

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