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FPH: First-class Polymorphism for Haskell

Dimitrios Vytiniotis, Stephanie Weirich and Simon Peyton Jones

The 13th ACM SIGPLAN International Conference on Functional Programming (ICFP 2008)
Victoria, British Columbia, Canada, September 22-24, 2008


Abstract

Languages supporting polymorphism typically have ad-hoc restrictions on where polymorphic types may occur. Supporting ``first-class'' polymorphism, by lifting those restrictions, is obviously desirable, but it is hard to achieve this without sacrificing type inference. We present a new type system for higher-rank and impredicative polymorphism that improves on earlier proposals: it is an extension of Damas-Milner; it relies only on System F types; it has a simple, declarative specification; it is robust to program transformations; and it enjoys a complete and decidable

type inference algorithm.


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