The connection between polymorphic and dynamic typing was originally considered by Curry et al. (1972) in the form of \u201cpolymorphic type assignment\u201d for untyped \u03bb-terms. Types are assigned after the fact to what is, in modern terminology, a dynamic language. Interest in type assignment was revitalized by the proposals of Bracha et al. (1998), and Bank et al. (1997) to enrich Java with polymorphism (generics), which in turn sparked the development of other languages, such as Scala, with similar combinations of features. In such a setting, where the target language already has a monomorphic type system, it is desirable to compile polymorphism to dynamic typing in such a way that as much static typing as possible is preserved, relying on dynamics only insofar as genericity is actually required. The basic approach is to compile polymorphism using embeddings from each type into a universal \u2018top\u2019 type, D, and partial projections that go in the other direction. This scheme is intuitively reasonable, and, indeed, has been used in practice many times (Igarashi et al., 2001). Proving its correctness, however, is non-trivial. This paper studies the compilation of System F to an extension of Moggi\u2019s computational metalanguage with a dynamic type and shows how the compilation may be proved correct using a logical relation.<\/p>\n","protected":false},"excerpt":{"rendered":"
The connection between polymorphic and dynamic typing was originally considered by Curry et al. (1972) in the form of \u201cpolymorphic type assignment\u201d for untyped \u03bb-terms. Types are assigned after the fact to what is, in modern terminology, a dynamic language. Interest in type assignment was revitalized by the proposals of Bracha et al. 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