NDLI: Intersection types and computational effects

Content Provider	ACM Digital Library
Author	Pfenning, Frank Davies, Rowan
Abstract	We show that standard formulations of intersection type systems are unsound in the presence of computational effects, and propose a solution similar to the value restriction for polymorphism adopted in the revised definition of Standard ML. It differs in that it is not tied to let-expressions and requires an additional weakening of the usual subtyping rules. We also present a bi-directional type-checking algorithm for the resulting language that does not require an excessive amount of type annotations and illustrate it through some examples. We further show that the type assignment system can be extended to incorporate parametric polymorphism. Taken together, we see our system and associated type-checking algorithm as a significant step towards the introduction of intersection types into realistic programming languages. The added expressive power would allow many more properties of programs to be stated by the programmer and statically verified by a compiler.
Starting Page	198
Ending Page	208
Page Count	11
File Format	PDF
ISBN	1581132026
DOI	10.1145/351240.351259
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2000-09-01
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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Intersection types and computational effects