2026-07-25T03:01:02Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:11408 2024-03-06T10:46:05Z ddc:004 open_access

Semantic Subtyping for Non-Strict Languages Petrucciani, Tommaso Castagna, Giuseppe Ancona, Davide Zucca, Elena Semantic subtyping non-strict semantics call-by-need union types intersection types Semantic subtyping is an approach to define subtyping relations for type systems featuring union and intersection type connectives. It has been studied only for strict languages, and it is unsound for non-strict semantics. In this work, we study how to adapt this approach to non-strict languages: in particular, we define a type system using semantic subtyping for a functional language with a call-by-need semantics. We do so by introducing an explicit representation for divergence in the types, so that the type system distinguishes expressions that are results from those which are computations that might diverge. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Tommaso Petrucciani and Giuseppe Castagna and Davide Ancona and Elena Zucca 2019 Is Part Of LIPIcs, Volume 130, 24th International Conference on Types for Proofs and Programs (TYPES 2018) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.TYPES.2018.4 urn:nbn:de:0030-drops-114083 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TYPES.2018.4 eng https://creativecommons.org/licenses/by/3.0/legalcode