A Formalization of Opaque Definitions for a Dependent Type Theory

Definitions allow for reuse of code. Typical type-checkers for dependently typed programming languages automatically unfold definitions, but excessive unfolding can lead to types that are hard to read, or performance issues. Such problems can be mitigated through the use of opaque definitions, which give the programmer control over when unfolding is allowed. However, subject reduction fails to hold for certain designs.

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Published
2025-10-09
DOI
https://doi.org/10.1145/3759538.3759653
Primary Topic
Logic, programming, and type systems
Type
article
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0.00

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article

A Formalization of Opaque Definitions for a Dependent Type Theory

E. Geng, Nils Anders Danielsson
Logic, programming, and type systems
article

A Formalization of Opaque Definitions for a Dependent Type Theory

E. Geng, Nils Anders Danielsson
article en

Abstract

Definitions allow for reuse of code. Typical type-checkers for dependently typed programming languages automatically unfold definitions, but excessive unfolding can lead to types that are hard to read, or performance issues. Such problems can be mitigated through the use of opaque definitions, which give the programmer control over when unfolding is allowed. However, subject reduction fails to hold for certain designs.

Chalmers University of Technology (SE), University of Gothenburg (SE)
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Openalex Percentile: Top 85%
Logic, programming, and type systems
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A Formalization of Opaque Definitions for a Dependent Type Theory — E. Geng, Nils Anders Danielsson · (2025) | TGRS Research Map | TGRS