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Programmers can use gradual types to migrate programs to have more precise type annotations and thereby improve their readability, efficiency, and safety. Such migration requires an exploration of the migration space and can benefit from tool support, as shown in previous work. Our goal is to provide a foundation for better tool support by settling decidability questions about migration with gradual types. We present three algorithms and a hardness result for deciding key properties and we explain how they can be useful during an exploration. In particular, we show how to decide whether the migration space is finite, whether it has a top element, and whether it is a singleton. We also show that deciding whether it has a maximal element is NP-hard. Our implementation of our algorithms worked as expected on a suite of microbenchmarks.

What is Decidable about Gradual Types? (proceedings-version-with-badges.pdf)483KiB
(POPL_slides (1).pdf)269KiB

Wed 22 Jan
Times are displayed in time zone: (GMT-06:00) Saskatchewan, Central America change

14:00 - 15:05: Research Papers - Gradual Typing / Language Design at Ile de France III (IDF III)
Chair(s): Jeremy G. SiekIndiana University, USA
POPL-2020-Research-Papers14:00 - 14:21
Zeina MigeedUniversity of California, Los Angeles, Jens PalsbergUniversity of California, Los Angeles
Link to publication DOI Media Attached File Attached
POPL-2020-Research-Papers14:21 - 14:43
Max NewNortheastern University, Dustin JamnerNortheastern University, USA, Amal AhmedNortheastern University, USA
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POPL-2020-Research-Papers14:43 - 15:05
Lukas LazarekNorthwestern University, Alexis KingNorthwestern University, Samanvitha SundarNorthwestern University, Robby FindlerNorthwestern University, USA, Christos DimoulasPLT @ Northwestern University
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