Intersection Subtyping with Constructors

Olivier Laurent
(Univ Lyon, EnsL, UCBL, CNRS, LIP, F-69342, LYON Cedex 07, France)

We study the question of extending the BCD intersection type system with additional type constructors. On the typing side, we focus on adding the usual rules for product types. On the subtyping side, we consider a generic way of defining a subtyping relation on families of types which include intersection types. We find back the BCD subtyping relation by considering the particular case where the type constructors are intersection, omega and arrow. We obtain an extension of BCD subtyping to product types as another instance. We show how the preservation of typing by both reduction and expansion is satisfied in all the considered cases. Our approach takes benefits from a "subformula property" of the proposed presentation of the subtyping relation.

In Michele Pagani and Sandra Alves: Proceedings Twelfth Workshop on Developments in Computational Models and Ninth Workshop on Intersection Types and Related Systems (DCM 2018 and ITRS 2018 ), Oxford, UK, 8th July 2018, Electronic Proceedings in Theoretical Computer Science 293, pp. 73–84.
Published: 23rd April 2019.

ArXived at: http://dx.doi.org/10.4204/EPTCS.293.6 bibtex PDF
References in reconstructed bibtex, XML and HTML format (approximated).
Comments and questions to: eptcs@eptcs.org
For website issues: webmaster@eptcs.org