文章基本信息

标题：Semantic Subtyping for Non-Strict Languages
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作者：Tommaso Petrucciani ; Giuseppe Castagna ; Davide Ancona 等
期刊名称：LIPIcs : Leibniz International Proceedings in Informatics
电子版ISSN：1868-8969
出版年度：2019
卷号：130
页码：1-24
DOI：10.4230/LIPIcs.TYPES.2018.4
出版社：Schloss Dagstuhl -- Leibniz-Zentrum fuer Informatik
摘要：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.
关键词：Semantic subtyping; non-strict semantics; call-by-need; union types; intersection types