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Haskell-style overloading is NP-hard

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1 Author(s)
Volpano, D.M. ; Dept. of Comput. Sci., Naval Postgraduate Sch., Monterey, CA, USA

Extensions of the ML type system, based on constrained type schemes, have been proposed for languages with overloading. Type inference in these systems requires solving the following satisfiability problem. Given a set of type assumptions C over finite types and a type basis A, is there is a substitution S that satisfies C in that A implies that CS is derivable? Under arbitrary overloading, the problem is undecidable. Haskell limits overloading to a form similar to that proposed by Kaes (1988) called parametric overloading. We formally characterize parametric overloading in terms of a regular tree language and prove that although decidable, satisfiability is NP-hard when overloading is parametric

Published in:

Computer Languages, 1994., Proceedings of the 1994 International Conference on

Date of Conference:

16-19 May 1994

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