Technical Reports (CIS)

Document Type

Technical Report

Date of this Version

November 1989

Comments

University of Pennsylvania Department of Computer and Information Science Technical Report No. MS-CIS-89-63.

Abstract

Inheritance in the form of subtyping is considered in the framework of a polymorphic type discipline with records, variants, and recursive types. We give a denotational semantics based on the paradigm that interprets subtyping as explicit coercion. The main technical result gives a coherent interpretation for a strong rule for deriving inheritances between recursive types.

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Date Posted: 28 January 2008