Blogs (28) >>
ICFP 2017
Sun 3 - Sat 9 September 2017 Oxford, United Kingdom
Fri 8 Sep 2017 14:00 - 14:30 at L1 - Day 2, Session 4

Functional dependencies are a popular extension to Haskell’s type-class system because they provide fine-grained control over type inference, resolve ambiguities and even enable type-level computations.

Unfortunately, several aspects of Haskell’s functional dependencies are ill-understood. In particular, the GHC compiler does not properly enforce the functional dependency property, and rejects well-typed programs because it does not know how to elaborate them into its core language, System FC.

This paper presents a novel formalization of functional dependencies that addresses these issues: We explicitly capture the functional dependency property in the type system, in the form of explicit type equalities. We also provide a type inference algorithm and an accompanying elaboration strategy which allows all well-typed programs to be elaborated into System FC.

Fri 8 Sep
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14:00 - 15:00: Haskell 2017 - Day 2, Session 4 at L1
haskellsymp-2017-papers14:00 - 14:30
Georgios KarachaliasKU Leuven, Belgium, Tom SchrijversKU Leuven
haskellsymp-2017-papers14:30 - 15:00
Gert-Jan Bottu, Georgios KarachaliasKU Leuven, Belgium, Tom SchrijversKU Leuven, Bruno C. d. S. OliveiraUniversity of Hong Kong, China, Philip WadlerUniversity of Edinburgh, UK